A dishwasher cleans plates, glasses, cookware, and cutlery every day, but the dishwasher itself also needs regular cleaning. Food particles, grease, detergent residue, mineral deposits, and stagnant water can accumulate inside the tub, filter, spray arms, door seals, drain area, and other components. Over time, this buildup can contribute to unpleasant odors, poor cleaning performance, cloudy dishes, drainage problems, and reduced water circulation. Manufacturer maintenance guidance consistently emphasizes cleaning the filter, spray arms, interior surfaces, and other components as part of routine dishwasher care.

Cleaning the inside of a dishwasher does not usually require complicated equipment. In most cases, the process involves removing the racks, inspecting and cleaning the filter, checking the spray arms, wiping the tub and door seals, removing visible debris, and then running an appropriate cleaning cycle. Depending on the dishwasher and the type of buildup, a manufacturer-approved dishwasher cleaner, vinegar, or another appropriate descaling approach may be used. The exact procedure varies by model, so the owner’s manual should always take priority over generic cleaning instructions.

An important distinction is that cleaning a dishwasher is not the same thing as sanitizing dishes. A dishwasher’s cleaning cycle is intended to remove food and soil, while sanitization involves achieving a defined reduction in microorganisms under specified conditions. Some residential dishwashers are certified to a sanitation standard, but that performance applies under the specified sanitizing cycle and operating conditions.

This guide explains how to clean the inside of a dishwasher thoroughly, how often different components should be cleaned, what to do about odors and limescale, which cleaning methods require caution, and how the process applies to households in the United States, Canada, and the United Kingdom.

Why Should You Clean the Inside of a Dishwasher?

A dishwasher is constantly exposed to food residue and dirty wash water. Although the machine is designed to remove soil from dishes, some material is captured by the filter rather than disappearing immediately through the drain.

The dishwasher filter is particularly important because it catches food particles, protects the pump from debris, and helps prevent removed soil from being redistributed onto dishes. When the filter becomes clogged, dishwasher performance can deteriorate and odors can develop.

Spray arms also require attention. Their small openings distribute wash water throughout the tub. Food particles, mineral deposits, and other debris can block these openings, reducing water flow and interfering with proper cleaning. Manufacturers recommend inspecting the spray-arm openings and cleaning them when necessary.

The interior walls can accumulate grease, detergent residue, hard-water deposits, and other material. Mineral deposits are particularly noticeable in areas with hard water because dissolved minerals can form deposits on surfaces exposed to heated water. Regular cleaning can help keep these deposits under control.

Cleaning also helps address odors. Food residue trapped in filters, spray arms, drain areas, seals, and other locations can contribute to unpleasant smells. Cleaning the areas where debris accumulates is generally more useful than simply attempting to mask the odor with fragrance.

How Often Should You Clean a Dishwasher?

There is no single cleaning schedule that applies perfectly to every dishwasher.

A heavily used dishwasher in a large household may require more frequent filter cleaning than a lightly used dishwasher. Hard water can also increase the need for mineral-deposit maintenance. Models with removable filters generally make routine cleaning easier. Manufacturer recommendations should therefore be used as the primary schedule.

A practical maintenance schedule can look like this:

Dishwasher Component	Suggested Attention
Filter	Inspect regularly and clean when debris accumulates
Spray arms	Inspect regularly; clean blocked openings
Door seal	Wipe periodically
Interior walls	Wipe when residue or buildup appears
Drain area	Inspect during filter cleaning
Detergent dispenser	Clean when residue accumulates
Racks	Clean when food or mineral residue appears
Deep interior cleaning	Periodically, according to use and manufacturer instructions
Hard-water descaling	When mineral deposits become visible or performance declines
Exterior/controls	Wipe regularly

Some manufacturers recommend dedicated cleaning cycles at intervals such as monthly or after a certain number of cycles, while others recommend cleaning based on visible buildup and usage. Follow your model’s instructions rather than treating any single interval as mandatory for every dishwasher.

What You Need to Clean a Dishwasher Inside

For normal cleaning, you may need:

Soft microfiber cloth
Soft sponge
Soft toothbrush or small cleaning brush
Mild dishwashing detergent for manual component cleaning where permitted
Warm running water
Dishwasher-safe container
Manufacturer-approved dishwasher cleaner
Distilled white vinegar where the manufacturer’s instructions permit it
Gloves if preferred for handling dirty components
Paper towel or clean cloth

Avoid abrasive scouring pads, harsh chemicals, metal tools, and improvised objects that could damage plastic, rubber, stainless steel, filters, or spray-arm openings.

A soft brush is particularly useful for filters and spray arms because it can remove deposits without unnecessarily damaging delicate mesh or small openings. Manufacturer instructions commonly recommend running water and a soft brush for filter cleaning.

Before You Start Cleaning

Before cleaning the dishwasher interior, remove all dishes, glasses, cookware, detergent containers, and loose objects.

If the dishwasher has recently completed a hot cycle, allow it to cool before reaching inside. Hot water and internal components can cause burns.

If you intend to remove the filter, spray arms, or other components, check the owner’s manual first. Different dishwasher designs use different locking mechanisms. A component that twists out on one model may require a different procedure on another.

Do not force a filter, spray arm, cover, or other component. If it does not release according to the manufacturer’s instructions, stop and check the manual.

Step 1: Remove the Dishwasher Racks

Start by removing the lower rack.

Depending on the dishwasher design, you may also be able to remove the upper rack. Removing the racks gives you much better access to the filter, spray arms, tub floor, and side walls.

Inspect the rack wheels, clips, tines, and other components while they are outside the dishwasher.

Look for:

Food particles
Grease
Detergent residue
Mineral deposits
Rust or corrosion
Broken wheels
Damaged coating
Objects caught between rack components

Wash removable racks with warm water and a suitable mild cleaning solution if permitted by the manufacturer.

Allow heavily soiled racks to soak if necessary, but avoid using aggressive chemicals that could damage the rack coating or metal.

Step 2: Remove Visible Food Debris

Before using any cleaning cycle, remove large pieces of food or debris from the dishwasher.

Check:

Bottom of the tub
Around the filter
Drain opening
Corners
Door area
Beneath the lower spray arm
Around the door seal

Do not push debris deeper into the drain opening.

Use a paper towel or soft cloth to pick up larger pieces and dispose of them normally.

This preliminary cleaning matters because a dishwasher cleaner cannot substitute for physically removing large pieces of food.

Modern dishwashers and detergents are designed to handle food residue, and routine pre-rinsing of every dish is generally unnecessary. However, large scraps should still be scraped from dishes before loading.

Step 3: Clean the Dishwasher Filter

The filter is one of the most important parts of the dishwasher to clean.

It is usually located at the bottom of the tub, although its exact configuration varies.

The filter’s job is to capture food particles and other debris so that they do not repeatedly circulate through the dishwasher or interfere with the drain and pump system.

How to clean the filter

Remove the lower rack.
Locate the filter.
Follow the manufacturer’s instructions for unlocking it.
Lift or twist the filter out.
Rinse it under running water.
Use a soft brush to remove trapped debris.
Inspect the mesh carefully.
Clean any surrounding filter area.
Reinstall the filter correctly.
Make sure it is locked securely.

Some filters contain multiple sections, such as a cylindrical filter and a flat mesh screen. If your model has multiple pieces, clean each according to the manual.

Do not operate a dishwasher with a removable filter incorrectly installed. A poorly installed filter can interfere with proper operation and may allow debris into areas where it does not belong.

Why a Dirty Filter Causes Bad Smells

A filter filled with food particles is an obvious source of odor.

Food trapped in a damp environment can become unpleasant over time. Because the filter sits directly in the dishwasher’s water-management system, residue can be repeatedly exposed to moisture during wash cycles.

Cleaning the filter removes this accumulated material rather than simply attempting to cover the smell.

If the odor remains after cleaning the filter, inspect the spray arms, drain area, door seal, tub, and drainage system. Persistent odors can sometimes originate outside the dishwasher itself, such as from a drainage problem.

Step 4: Clean the Spray Arms

Spray arms are another critical part of dishwasher maintenance.

The small holes in the arms distribute water across the dishes. If those holes become blocked, water cannot spray properly.

Remove the spray arms only if your model’s instructions allow it.

Then:

Rinse the spray arm under running water.
Inspect each spray opening.
Remove visible debris.
Use a small soft brush if necessary.
Rinse thoroughly.
Make sure water can pass through the openings.
Reinstall the arm.
Rotate it manually to confirm that it moves freely.

Manufacturers specifically warn that blocked spray-arm openings can reduce water distribution and cleaning performance.

What Can Block Dishwasher Spray Arms?

Common obstructions include:

Food particles
Seeds
Eggshell fragments
Small pieces of paper
Mineral deposits
Detergent residue

Hard-water scale can be especially troublesome because it can accumulate around small openings.

Do not enlarge spray-arm openings with sharp metal objects. The openings are engineered to produce particular water-flow characteristics, so damaging them can change how the dishwasher operates.

A soft brush or the cleaning method specified by the manufacturer is preferable.

Step 5: Clean the Dishwasher Door

The inside of the dishwasher door can collect detergent residue, grease, food particles, and moisture.

Open the door fully and inspect:

Inner door panel
Lower edge
Door corners
Detergent dispenser
Rinse-aid dispenser
Door hinges
Gasket area

Use a soft damp cloth to wipe accessible surfaces.

Pay particular attention to the area around the detergent dispenser. Dried detergent can accumulate around the dispenser door and interfere with proper opening or dispensing.

Do not flood the control panel with water. Use only the cleaning method recommended for the specific appliance.

Step 6: Clean the Door Gasket

The door gasket creates a seal between the door and the dishwasher tub.

Food particles, grease, detergent residue, and moisture can accumulate along the gasket.

Wipe the gasket gently with a damp cloth.

Inspect the folds and corners carefully.

Look for:

Food debris
Black or discolored deposits
Grease
Mineral residue
Cracks
Tears
Deformation

Do not pull aggressively on the gasket.

If the gasket is damaged, cleaning alone will not restore its sealing ability. A damaged gasket may require replacement according to the manufacturer’s service instructions.

Step 7: Clean the Dishwasher Tub

Once the filter and spray arms have been cleaned, inspect the tub itself.

Look at:

Side walls
Rear wall
Bottom
Corners
Door area
Around the filter
Around the spray-arm mounting area

A soft cloth or sponge can remove loose residue.

For stubborn deposits, use a dishwasher cleaner or other product specifically intended for dishwasher use, following its label and the dishwasher manufacturer’s instructions.

Some manufacturers recommend a dedicated dishwasher cleaner for grease, limescale, mineral deposits, and odors.

Step 8: Clean the Dishwasher Drain Area

The drain area is especially important because dirty water passes through it.

After removing the filter, inspect the exposed area for:

Food particles
Broken glass
Labels
Plastic fragments
Seeds
Grease
Other foreign objects

Use caution when checking this area. Broken glass can be extremely difficult to see.

Do not place your hand blindly into the drain or pump area.

If an object is lodged where you cannot safely remove it, follow the manufacturer’s service procedure.

A clogged filter or drain area can contribute to poor drainage and poor cleaning performance.

Step 9: Clean the Detergent Dispenser

The detergent dispenser should release detergent during the wash cycle.

If detergent residue builds up around the dispenser, it can interfere with the dispenser door or leave old detergent deposits inside the compartment.

Use a damp cloth and soft brush to clean accessible residue.

Do not force the dispenser door.

If the dispenser is damaged or remains blocked after cleaning, it may require repair or replacement.

Step 10: Clean Mineral Deposits and Limescale

Hard water is a common reason dishwashers develop white or chalky deposits.

Water hardness is primarily associated with dissolved calcium and magnesium. When water is heated and evaporates, mineral deposits can accumulate on appliance surfaces.

You may notice:

White film
Chalky deposits
Cloudy surfaces
Deposits around spray holes
Mineral buildup near the tub floor
Reduced spray performance

The appropriate treatment depends on the dishwasher and the severity of the deposits.

Some manufacturers recommend dishwasher cleaners or specific descaling procedures. Others provide instructions for using vinegar or citric acid under particular circumstances. Follow your appliance’s instructions rather than assuming that one descaling method is suitable for every model.

Step 11: Run a Dishwasher Cleaning Cycle

After manually cleaning the filter, spray arms, drain area, and visible surfaces, you can run an empty cleaning cycle if the manufacturer recommends it.

A dedicated Self Clean, Machine Clean, or similar program is generally the preferred option when the dishwasher has one.

Some manufacturers instruct users to run a dedicated cleaning cycle with the dishwasher empty, while other models can use an appropriate normal or hot cycle with a dishwasher cleaning product.

Always check whether detergent, dishwasher cleaner, vinegar, or another cleaning product is required for the specific cycle.

Should You Run a Dishwasher Empty to Clean It?

Yes, an empty cycle can be an appropriate way to clean the dishwasher interior.

In fact, some dishwasher manufacturers specifically instruct users to run self-cleaning or cleaning cycles with the dishwasher empty.

The purpose is to allow the cleaning solution and wash water to contact the dishwasher’s interior rather than being consumed by dishes.

An empty cycle is especially useful after manually cleaning the filter and spray arms because it addresses interior surfaces that cannot easily be wiped by hand.

How to Use Dishwasher Cleaner

A dishwasher cleaner specifically designed for automatic dishwashers can be useful for:

Grease
Mineral deposits
Odors
Residue
Interior buildup

Follow the product label exactly.

Some cleaners are placed in the detergent compartment, while others are placed directly inside the dishwasher. The required cycle can also vary.

Do not assume that a household bathroom, toilet, oven, or floor cleaner is suitable for dishwasher interiors.

Dishwasher interiors are exposed to food-contact items, heated water, detergents, seals, pumps, filters, and other components. Using an inappropriate chemical can damage the appliance or leave unwanted residues.

Can You Clean a Dishwasher With White Vinegar?

In some dishwasher models, yes.

Several manufacturers provide vinegar-based cleaning instructions, but the concentration and method vary.

One manufacturer’s guidance, for example, instructs users to place approximately two cups of white vinegar in a dishwasher-safe measuring container on the bottom rack and run a complete cycle without detergent, while warning that vinegar is acidic and excessive use could damage the dishwasher.

Another current manufacturer’s cleaning guidance instructs users to place an approximately 8-ounce cup of distilled white vinegar upright in the lower basket and run an appropriate sanitizing cycle on supported models.

These differences demonstrate why generic vinegar recipes should not automatically be applied to every dishwasher.

If your manufacturer prohibits vinegar or provides a different procedure, follow that guidance.

Can Vinegar Remove Limescale?

Vinegar’s acidity can help dissolve some mineral deposits, which is why it is sometimes recommended for dishwasher cleaning.

However, vinegar is not automatically the best choice for every dishwasher or every type of buildup.

For significant mineral accumulation, a purpose-designed dishwasher cleaner or descaler may be more appropriate.

Current appliance guidance also describes vinegar as useful for mineral deposits in certain cleaning procedures, while warning against excessive use.

Can You Use Citric Acid to Clean a Dishwasher?

Some dishwasher manufacturers provide citric-acid cleaning instructions.

Citric acid can help address mineral deposits and certain types of residue.

However, concentration and placement matter. A manufacturer’s troubleshooting guidance may recommend a particular quantity of citric acid when vinegar does not resolve mineral buildup.

Do not assume that more citric acid produces better results. Excessive or inappropriate concentrations can potentially damage components or finishes.

Can You Use Baking Soda to Clean a Dishwasher?

Baking soda is sometimes used as a household cleaning material, but its use in a dishwasher should be guided by the manufacturer’s instructions.

Baking soda is alkaline rather than acidic, so it is not a direct substitute for an acidic descaler.

If your dishwasher manufacturer recommends a specific baking-soda cleaning procedure, follow it. Otherwise, a dishwasher cleaner specifically designed for the appliance is a more predictable option.

Can You Use Bleach to Clean a Dishwasher?

This requires particular caution.

Many modern dishwashers have stainless-steel interiors, and some manufacturers explicitly warn against using bleach in such models because it can damage or discolor the interior.

Bleach should therefore not be treated as a universal dishwasher-cleaning solution.

Never add bleach to a dishwasher unless the manufacturer specifically permits it for your exact model and provides appropriate instructions.

Never Mix Bleach and Vinegar

This is one of the most important safety rules.

Bleach should never be mixed with vinegar or other acidic cleaning products. The combination can produce chlorine gas, which can be dangerous to breathe.

More generally, do not mix different cleaning chemicals unless the product instructions explicitly say the combination is safe.

This means you should not experiment by combining:

Bleach and vinegar
Bleach and dishwasher cleaner
Bleach and descaler
Different commercial cleaners
Bleach and ammonia-containing products

Government safety guidance specifically recommends never mixing cleaning products because dangerous vapors or chemical reactions can result.

Never Use Hand Dish Soap Inside a Dishwasher

Hand dishwashing liquid is designed to produce foam.

An automatic dishwasher is not.

Using hand dish soap inside an automatic dishwasher can create excessive foam and cause a major mess. Automatic dishwasher detergents are formulated differently and should be used according to the appliance manufacturer’s instructions.

If you accidentally use hand dish soap, stop the dishwasher and follow the manufacturer’s procedure for removing excess suds rather than continuing the cycle.

How to Clean a Smelly Dishwasher

If your dishwasher smells bad, start with the source rather than simply adding fragrance.

Use this sequence:

Empty the dishwasher.
Remove and clean the filter.
Inspect the drain area.
Clean the spray arms.
Wipe the door seal.
Clean the interior.
Inspect the detergent dispenser.
Check for standing water.
Run an appropriate cleaning cycle.
Check the drain hose and sink connection if the smell persists.

Food debris, filters, spray arms, stagnant water, and drainage problems are among the areas manufacturers identify when troubleshooting dishwasher odors.

What If the Dishwasher Still Smells After Cleaning?

If the smell remains, investigate the drainage system.

A dishwasher may develop an odor if wastewater is not draining correctly.

Check for:

Standing water
Blocked filters
Drain hose problems
Sink drain problems
Garbage-disposal connection problems where applicable
Air-gap issues where applicable
Food debris near the drain
Improper drain installation

If the dishwasher repeatedly retains water after cycles, professional diagnosis may be necessary.

Persistent odor is not always an interior-cleaning problem.

How to Clean a Dishwasher That Has Standing Water

Standing water at the bottom of a dishwasher requires more than simply running another cleaning cycle.

First determine whether a small amount of water is normal for your specific dishwasher. Some designs retain a small amount of water in areas associated with the sump and pump.

If there is an unusually large amount of water:

Remove standing water according to the manufacturer’s instructions.
Clean the filter.
Inspect the drain area.
Check the drain hose.
Check the sink connection.
Check the air gap if the installation uses one.
Run an appropriate test cycle.

If the dishwasher still does not drain, service may be required.

How to Clean a Dishwasher With Hard Water

Hard water can create a different cleaning challenge.

If you see persistent white deposits despite cleaning the filter and spray arms, the problem may be mineral buildup rather than food residue.

A long-term strategy can include:

Testing household water hardness
Using dishwasher salt where the model supports it
Adjusting the dishwasher’s water-hardness setting
Using rinse aid
Periodically descaling
Using an appropriate dishwasher cleaner
Following local water-softening recommendations

Some dishwasher models have integrated water-softening systems and require a specific salt product. The correct setting depends on the hardness of the incoming water and the appliance.

How to Clean the Dishwasher if You Have Very Hard Water

Very hard water may require more frequent mineral-deposit maintenance.

Whirlpool guidance, for example, identifies extremely hard water as a situation where a water softener can be strongly recommended.

If your glasses repeatedly develop white spots, the spray-arm holes become restricted, or the dishwasher develops visible mineral scale, investigate water hardness rather than repeatedly increasing detergent.

Excessive detergent is not a substitute for correcting a hard-water problem.

How to Clean a Dishwasher With Grease Buildup

Grease can accumulate inside the tub, filter, spray arms, and drainage system.

Begin with manual cleaning:

Remove the racks.
Clean the filter.
Wipe visible grease.
Clean the spray arms.
Clean the door and gasket.
Run a suitable dishwasher-cleaning cycle.

A purpose-designed dishwasher cleaner can help remove grease and residue from internal areas that are difficult to reach manually.

For severe grease buildup, repeat the approved cleaning procedure rather than using increasingly aggressive household chemicals.

How to Clean a Dishwasher With Mold or Mildew-Like Growth

Dark or slimy material around seals and damp areas can be concerning.

Start by physically removing visible residue and addressing the moisture source.

Do not assume that simply killing mold is enough. General indoor-environment guidance emphasizes that visible mold and moisture problems should be addressed together, because residual material can remain even after microorganisms are killed.

If significant mold growth is present, the gasket is damaged, or the problem repeatedly returns, professional assessment may be appropriate.

Do not introduce bleach into a stainless-steel dishwasher simply because mold-like material is present.

How to Clean the Dishwasher Filter Without Damaging It

The filter should be handled carefully.

Do not:

Scrub aggressively with metal tools
Bend the mesh
Cut blocked openings
Use sharp objects
Force the locking mechanism
Operate the dishwasher with a damaged filter

Manufacturer instructions commonly recommend rinsing filters under running water and using a soft brush for stubborn debris.

A damaged filter may fail to perform its intended function, so replacement may be necessary.

How to Clean Dishwasher Spray Arms Without Damaging Them

Spray arms contain precision openings.

Avoid drilling, cutting, or enlarging the holes.

Instead:

Remove the arm according to the manual.
Rinse under running water.
Use a soft brush.
Remove visible debris.
Check each opening.
Ensure the arm rotates correctly after installation.

Manufacturer guidance specifically recommends clearing blocked nozzles and verifying that spray arms can distribute water properly.

How to Clean the Inside of a Stainless-Steel Dishwasher

Stainless-steel interiors should be treated carefully.

Use soft materials and products approved for dishwasher interiors.

Avoid:

Steel wool
Aggressive abrasive cleaners
Chlorine bleach unless explicitly approved
Strong acids used outside manufacturer instructions
Metal scraping tools

Some manufacturers specifically warn against bleach in stainless-steel interiors.

A stainless-steel tub is durable, but that does not mean it is resistant to every chemical.

How to Clean the Bottom of a Dishwasher

The bottom receives a large amount of food residue and dirty water.

Clean it by:

Removing the lower rack.
Removing the filter according to the manual.
Removing visible debris.
Cleaning the filter.
Inspecting the drain area.
Wiping the tub floor.
Cleaning the lower spray arm.
Reinstalling all components correctly.
Running an approved cleaning cycle.

Do not pour large quantities of household cleaner directly into the sump or drain opening.

How to Clean the Dishwasher Door Seal

The door seal should be wiped rather than aggressively scrubbed.

Use:

Damp microfiber cloth
Soft sponge
Mild cleaning solution if permitted

Work carefully around corners.

If you see cracks, tears, flattening, or other damage, replace the gasket according to the manufacturer’s procedure.

A clean gasket can also make it easier to identify whether the seal itself is deteriorating.

How to Clean a Dishwasher After Washing Dirty Dishes

You do not need to deep-clean the dishwasher after every load.

After normal use:

Scrape large food debris from dishes.
Check the filter periodically.
Wipe obvious residue.
Leave the dishwasher interior able to dry.
Run the appropriate maintenance cycle when necessary.

Modern dishwashers are designed to clean dishes without requiring users to rinse every plate beforehand. Excessive pre-rinsing can waste water and energy.

The goal is not to disinfect the machine after every load. The goal is to maintain the components that handle soil and water.

Should You Leave the Dishwasher Door Open After Cleaning?

Leaving the door slightly open after a cleaning cycle can help the interior dry, provided this is safe in your household and does not create a hazard.

Some manufacturer cleaning instructions specifically recommend leaving the door slightly open after cleaning to help reduce lingering moisture and odors.

Do not leave the door open if it creates a tripping hazard or is accessible to small children or pets.

How to Clean a Dishwasher Before Long-Term Storage

If a dishwasher will not be used for an extended period, clean it before storage.

Recommended preparation includes:

Empty the dishwasher.
Clean the filter.
Clean the spray arms.
Wipe the interior.
Clean the gasket.
Remove food residue.
Ensure the interior is dry.
Follow the manufacturer’s storage instructions.

The objective is to avoid leaving food residue and moisture trapped inside the appliance.

How to Clean a New Dishwasher

A new dishwasher may have manufacturing or packaging odors.

The exact first-use procedure varies.

Some manufacturers state that temporary odors from new materials can occur and may dissipate after several cycles.

If the manufacturer recommends an initial cleaning cycle, follow it.

Do not automatically add vinegar, bleach, baking soda, or another chemical to a brand-new dishwasher unless the instructions permit it.

Does Cleaning the Dishwasher Improve Cleaning Performance?

It can.

A clogged filter can affect soil removal and water circulation, while blocked spray-arm openings can restrict water distribution.

Cleaning these components restores the conditions the dishwasher needs to operate as designed.

However, poor cleaning can also be caused by:

Incorrect loading
Blocked spray arms
Insufficient water
Incorrect detergent
Hard water
Low water temperature
Mechanical faults
Damaged components

Cleaning the interior is therefore an important maintenance step but not a universal solution for every dishwasher problem.

Dishwasher Cleaning and Sanitization

Cleaning and sanitization should not be confused.

Cleaning removes visible soil and organic material.

Sanitization is a more specific performance claim.

Residential dishwashers certified to NSF/ANSI 184 can demonstrate a minimum 5-log, or 99.999%, reduction in bacteria when operated on the qualifying sanitizing cycle under the standard’s test conditions. The standard also includes performance requirements related to cleaning effectiveness.

This does not mean that manually cleaning the empty dishwasher automatically sanitizes it.

Nor does it mean that every dishwasher cycle provides the same sanitizing performance.

If sanitation is important, use the designated sanitizing cycle and follow the manufacturer’s instructions.

How Often Should You Deep Clean a Dishwasher?

A reasonable deep-cleaning frequency depends on usage.

A household that runs the dishwasher several times every day may need more frequent maintenance than a household that runs it a few times per week.

Factors that increase the need for cleaning include:

Heavy use
Large amounts of food residue
Hard water
Frequent low-temperature cycles
Persistent odors
Visible mineral deposits
Dirty filter
Poor cleaning results
Standing water

Some manufacturers recommend cleaning programs monthly or after a specified number of cycles, while others provide maintenance intervals based on model design.

A Simple Monthly Dishwasher Cleaning Routine

For many households, a monthly inspection is a useful starting point.

Week or month check

1. Inspect the filter

Remove and rinse it if necessary.

2. Inspect the spray arms

Check that the openings are clear.

3. Wipe the gasket

Remove food and residue.

4. Check the bottom

Remove visible debris.

5. Inspect the door

Clean detergent and grease residue.

6. Check for odors

If there is an odor, identify its source.

7. Run a cleaning cycle

Use the manufacturer’s recommended cleaner and cycle when needed.

This routine can be adjusted according to actual dishwasher usage.

How to Clean a Dishwasher in the USA

For U.S. households, follow the dishwasher manufacturer’s instructions first.

If the appliance has a dedicated cleaning cycle, use it according to the instructions.

If you use a commercial cleaning product, follow the product label.

For chemical safety, U.S. government guidance emphasizes reading labels, following directions, using appropriate ventilation, and never mixing incompatible cleaning products.

U.S. households should also distinguish ordinary cleaning from sanitation claims. If a dishwasher is certified to a residential sanitation standard, the certification applies under the specified cycle and conditions.

How to Clean a Dishwasher in Canada

Canadian households can follow the same fundamental maintenance process:

Clean the filter.
Inspect spray arms.
Remove food debris.
Clean the door seal.
Clean the tub.
Address hard-water deposits.
Run the manufacturer’s recommended cleaning cycle.

Canadian water conditions vary considerably by location, so hard-water problems may be more important in some areas than others.

If mineral deposits are persistent, determine the household water hardness and use the dishwasher’s water-softening or descaling features where available.

The same chemical safety principle applies: do not mix cleaning products and always follow the product label and appliance instructions.

How to Clean a Dishwasher in the UK

The fundamental process is also the same in the UK.

Clean the filter and spray arms regularly, remove food residue, inspect the door seal, and use an appropriate dishwasher cleaner or descaling procedure when necessary.

UK households should also consider local water hardness because hard water can contribute to limescale formation.

The specific cleaning product should be compatible with the appliance and used according to its label.

If your dishwasher has a dedicated cleaning or maintenance cycle, use that program according to the manufacturer’s instructions.

Common Dishwasher Cleaning Mistakes

Mistake 1: Only Cleaning the Tub

A shiny tub does not necessarily mean a clean dishwasher.

The filter and spray arms can remain dirty even when the visible stainless-steel surfaces look clean.

Mistake 2: Ignoring the Filter

The filter is one of the most important maintenance components.

Mistake 3: Using Too Much Cleaner

More chemical does not automatically mean better cleaning.

Follow the product instructions.

Mistake 4: Using Bleach Automatically

Bleach can damage some dishwasher interiors, particularly stainless-steel interiors.

Mistake 5: Mixing Vinegar and Bleach

This can create dangerous chlorine gas.

Mistake 6: Using Hand Dish Soap

Hand dishwashing liquid can create excessive foam inside an automatic dishwasher.

Mistake 7: Scrubbing Stainless Steel With Abrasive Materials

This can scratch or damage the surface.

Mistake 8: Ignoring Hard Water

Repeated mineral buildup may require water-hardness management rather than repeated surface cleaning.

Mistake 9: Forgetting the Spray Arms

Blocked nozzles can reduce water distribution.

Mistake 10: Cleaning Without Reading the Manual

Different dishwasher designs use different filters, spray arms, cleaners, and maintenance cycles.

A Complete Dishwasher Interior Cleaning Checklist

Use this checklist whenever you perform a deep clean:

Before cleaning

Empty dishwasher
Allow hot components to cool
Check owner’s manual
Gather cleaning supplies

Interior

Remove lower rack
Remove upper rack if appropriate
Remove visible debris
Clean filter
Inspect drain
Clean spray arms
Wipe tub
Clean door
Clean gasket
Clean detergent dispenser
Check rinse-aid area

Deep cleaning

Check for mineral deposits
Select approved dishwasher cleaner
Run recommended empty cycle
Use vinegar only if permitted
Avoid bleach unless specifically approved
Never mix cleaning chemicals

After cleaning

Reinstall filter correctly
Reinstall spray arms
Reinstall racks
Confirm spray arms rotate freely
Check drainage
Allow interior to dry

Dishwasher Cleaning Troubleshooting Table

Problem	Likely Area to Check	Recommended Action
Bad smell	Filter, drain, spray arms, gasket	Clean components and check drainage
White deposits	Tub, spray arms, heater area	Address hard water and descale appropriately
Poor cleaning	Filter, spray arms, loading	Clean and inspect circulation
Dirty glasses	Spray arms, filter, detergent, water hardness	Inspect all relevant areas
Standing water	Filter, drain, hose	Clean and inspect drainage
Detergent remaining	Dispenser, water circulation	Clean dispenser and spray system
Greasy interior	Filter, tub	Deep-clean with approved cleaner
Blocked spray	Spray-arm openings	Remove debris and mineral deposits
Black residue	Gasket, damp areas	Clean and investigate recurring moisture
Cloudy interior	Mineral deposits	Use appropriate descaling procedure

50 Frequently Asked Questions About Cleaning a Dishwasher Inside

1. How often should I clean my dishwasher inside?

Inspect the filter and other components regularly and perform a deeper cleaning according to the manufacturer’s maintenance schedule, household usage, water hardness, and visible buildup.

2. What is the most important part to clean?

The filter is one of the most important components because it captures food debris and protects the dishwasher’s water-management system.

3. Should I clean the dishwasher filter every week?

Not necessarily. The appropriate frequency depends on use and the manufacturer’s recommendations. Inspect it regularly and clean it when debris accumulates.

4. Can I run my dishwasher empty to clean it?

Yes. Many manufacturers provide empty self-cleaning or maintenance-cycle instructions.

5. Can I use vinegar to clean my dishwasher?

Some manufacturers permit vinegar cleaning, while others may recommend dedicated cleaners. Follow the instructions for your model.

6. How much vinegar should I use?

There is no universal amount. Manufacturer instructions vary, with some specifying approximately two cups and others approximately eight ounces for particular procedures.

7. Can vinegar damage a dishwasher?

Frequent or inappropriate use can potentially damage components because vinegar is acidic. Some manufacturers specifically warn against excessive use.

8. Can I use baking soda?

Only use it if your dishwasher manufacturer permits the procedure. It should not automatically be treated as a universal dishwasher cleaner.

9. Can I use citric acid?

Some manufacturers recommend citric acid for mineral buildup under specified conditions. Follow the model-specific quantity and procedure.

10. Can I use bleach?

Do not use bleach unless your dishwasher manufacturer specifically permits it. Some stainless-steel interiors can be damaged or discolored by bleach.

11. Can I mix bleach and vinegar?

Absolutely not. The combination can release dangerous chlorine gas.

12. Can I use hand dishwashing liquid?

No. It can create excessive suds in an automatic dishwasher.

13. Why does my dishwasher smell bad?

Common areas to investigate include the filter, spray arms, drain, gasket, tub, and drainage system.

14. Why does my dishwasher have a white film?

Hard-water minerals are one possible cause.

15. How do I remove limescale?

Use the descaling procedure recommended for your dishwasher and address the underlying water-hardness problem where appropriate.

16. Why are my spray arms blocked?

Food debris and mineral deposits can accumulate in the small spray openings.

17. Can I use a toothpick to clean spray-arm holes?

Some manufacturers recommend small non-damaging tools for removing debris, but follow your model’s instructions.

18. Can I use a metal needle?

It is better to avoid modifying the spray openings. Use the manufacturer’s recommended cleaning method.

19. Should I remove the spray arms?

Only if your model is designed for removal and the manual provides instructions.

20. Why is there food at the bottom of my dishwasher?

The filter may need cleaning, or the drain system may have a problem.

21. Why is my filter dirty?

The filter is designed to collect food particles, so some accumulation is normal.

22. Should I clean the filter with soap?

Some manufacturer instructions permit mild soap and a soft brush; others may specify water only. Follow the model instructions.

23. Can I put the dishwasher filter in the sink?

Yes, if it is removable. Clean it separately using the manufacturer’s recommended method.

24. How do I clean the dishwasher gasket?

Wipe it gently with a damp soft cloth and remove food particles and residue from the folds.

25. How do I clean the dishwasher door?

Use a soft damp cloth and clean the inner panel, dispenser area, corners, and gasket.

26. How do I clean the dishwasher drain?

Start by cleaning the filter and inspecting the accessible drain area. Do not put your hand blindly into the pump area.

27. Why does my dishwasher have standing water?

Possible causes include a clogged filter, blocked drain, drain-hose issue, or plumbing problem.

28. Can dishwasher cleaner remove odors?

A suitable dishwasher cleaner can help remove grease, residue, mineral deposits, and odor sources.

29. Should I clean my dishwasher every month?

Monthly inspection is a useful routine for many households, but the actual cleaning frequency should be adjusted according to usage and manufacturer guidance.

30. Can hard water damage a dishwasher?

Mineral deposits from hard water can contribute to scale and interfere with dishwasher performance.

31. Does rinse aid clean the dishwasher?

Rinse aid primarily assists the dishwashing and drying process; it is not a substitute for cleaning the dishwasher interior.

32. Should I run a hot cycle when cleaning?

Use the cycle recommended by the dishwasher cleaner and manufacturer. A dedicated cleaning or sanitizing cycle may be appropriate on supported models.

33. Does a sanitize cycle clean the dishwasher?

A sanitize cycle is primarily intended for sanitization performance under specified conditions. It does not eliminate the need to clean filters, spray arms, and other components.

34. Is cleaning the dishwasher the same as sanitizing it?

No. Cleaning removes soil; sanitization is a specific reduction of microorganisms under defined conditions.

35. Can an NSF-certified dishwasher sanitize dishes?

A dishwasher certified to NSF/ANSI 184 can meet the standard’s specified sanitization performance when operated on its qualifying sanitizing cycle.

36. Can I use bathroom cleaner inside my dishwasher?

No, unless the product is specifically approved for that application and the dishwasher manufacturer permits it.

37. Can I use oven cleaner?

Do not use oven cleaner inside a dishwasher unless the manufacturer explicitly approves it.

38. Can I use chlorine tablets?

Do not use chlorine products unless specifically approved for the dishwasher.

39. How do I remove grease from a dishwasher?

Clean the filter and visible residue, then use a dishwasher cleaner designed to remove grease if recommended for the appliance.

40. Why does my dishwasher smell even after cleaning?

Check the drain system, filter, gasket, standing water, and sink connection. Persistent odors may originate from drainage problems rather than the tub itself.

41. Should I leave the dishwasher door open?

Leaving it slightly open after cleaning can help the interior dry, provided doing so is safe in your household and does not create a hazard.

42. Can I clean the dishwasher while it is connected to power?

For normal wipe-down cleaning, follow the manufacturer’s safety instructions. For service, disassembly, or work near electrical components, power should be handled according to the manufacturer’s instructions and applicable electrical-safety requirements.

43. Should I wear gloves?

Gloves can be useful when handling dirty filters or cleaning chemicals, particularly if the product label recommends protective equipment.

44. Why does my dishwasher leave dirty dishes after cleaning?

Possible causes include clogged filters, blocked spray arms, incorrect loading, insufficient water, detergent problems, hard water, or mechanical faults.

45. Does cleaning the filter improve dishwasher performance?

It can. A clogged filter can interfere with proper cleaning and water management.

46. Can I clean a dishwasher without a commercial cleaner?

In some models, yes. Manual cleaning and manufacturer-approved household methods may be sufficient. However, dedicated dishwasher cleaners can be useful for specific buildup.

47. What is the best dishwasher cleaner?

The best choice is one specifically intended for automatic dishwashers and compatible with your model. Follow the manufacturer’s instructions and the cleaner’s label.

48. Can I clean the dishwasher with only water?

Water can remove loose debris, but it may not adequately remove grease or mineral buildup.

49. Should I clean the filter before running dishwasher cleaner?

Yes, it is generally sensible to remove major debris first so the cleaning cycle is not being asked to process a heavily contaminated filter.

50. What is the easiest way to keep a dishwasher clean?

Regularly scrape large food debris from dishes, keep the filter clean, inspect the spray arms, clean the gasket, and periodically run the manufacturer’s recommended maintenance cycle.

Final Thoughts

Cleaning the inside of a dishwasher is primarily about maintaining the components that handle dirty water, food particles, grease, minerals, and moisture.

The most important areas are the filter, spray arms, drain area, dishwasher tub, door gasket, detergent dispenser, and interior door. Cleaning these areas regularly helps maintain water circulation and can reduce the buildup that contributes to odors and poor cleaning performance.

A good deep-cleaning process starts with manually removing debris rather than immediately adding chemicals. Clean the filter, inspect the drain area, clear the spray arms, wipe the gasket and tub, and then use an appropriate dishwasher-cleaning cycle if necessary.

For mineral buildup, consider the underlying water hardness instead of repeatedly treating the symptoms. Hard water can contribute to scale, and some dishwashers provide built-in water-softening systems or hardness settings that should be configured according to the manufacturer’s instructions.

When using cleaning chemicals, safety is critical. Never mix bleach with vinegar or other incompatible cleaners, and never assume that a bathroom, oven, floor, or general-purpose cleaner is appropriate for a dishwasher. Government safety guidance emphasizes following labels and avoiding chemical combinations that can produce dangerous vapors.

Finally, remember that cleaning a dishwasher and sanitizing dishes are different processes. A clean dishwasher is maintained by removing soil and deposits from its components, while sanitation performance depends on the specific appliance, cycle, temperature, and applicable certification requirements.

For households in the USA, UK, and Canada, the basic maintenance principles are essentially the same, but the exact cleaning products, appliance instructions, water conditions, and applicable safety requirements can differ. The safest approach is therefore to combine general dishwasher-maintenance principles with the manufacturer’s instructions for the exact model.

A clean filter, unobstructed spray arms, clean gasket, clear drain area, controlled mineral buildup, and regular maintenance cycle can go a long way toward keeping a dishwasher operating efficiently and delivering consistent cleaning results.