How to Clean a Dishwasher When It Starts Smelling or Leaving Residue

A dishwasher can look empty and still need cleaning.

Food particles collect in the filter. Grease and detergent residue settle around the door seal. Mineral deposits form on internal surfaces. Small pieces of labels, broken glass, seeds, or food can block the filter or spray-arm openings.

Eventually, you may notice:

An unpleasant smell
Cloudy or gritty dishes
Food particles left after a cycle
Water collecting in the bottom
Reduced spray performance
Greasy residue inside the machine
A musty smell between washes

The right cleaning process depends on your dishwasher model. Some machines have removable filters, while others use a different filtration or disposal system. Start by checking the owner’s manual before taking anything apart or running a cleaning product through the appliance.

Start With an Empty, Cool Dishwasher

Wait until the dishwasher has finished its cycle and cooled down.

Remove all dishes, utensils, racks or accessories that the manual allows you to take out. Check the bottom of the tub for loose food, pieces of paper labels, bones, toothpicks, seeds, or broken glass.

Wear gloves if you need to remove debris by hand. Broken glass can be difficult to see in standing water or around the filter.

Turn off electrical power at the appropriate switch or breaker before reaching into pump areas or removing components when your manual requires it. Do not dismantle electrical or mechanical parts that are not intended for routine owner maintenance.

Check for Standing Water First

A small amount of water around the filter area may be normal for some dishwashers. A large pool that remains after the cycle may indicate a drainage problem.

Before cleaning, check for simple causes:

The cycle was interrupted
The filter is heavily blocked
The drain hose is kinked
The sink drain or garbage disposal is blocked
The garbage-disposal knockout plug was not removed during installation
A large item prevented the door from closing properly
The dishwasher is showing an error code

Cleaning the filter may help when food debris is restricting water flow. However, a dishwasher that repeatedly fails to drain may need troubleshooting or service rather than another cleaning cycle.

Find Out Whether the Filter Is Removable

The filter is normally located beneath the lower spray arm at the bottom of the dishwasher.

Depending on the model, it may have:

A cylindrical upper filter
A flat lower filter
A twist-lock design
A lift-out screen
A self-cleaning filtration system that should not be removed casually

Check the manual before pulling or twisting it. Forcing a filter in the wrong direction can damage the locking tabs.

Some filters are not designed to be removed by the owner.

Remove and Clean the Filter

When your dishwasher has a removable filter, follow the model-specific instructions.

A typical process is:

Pull out the lower rack.
Turn the cylindrical filter in the indicated direction.
Lift it out carefully.
Remove the flat filter beneath it if the manual allows.
Check the filter well for debris.
Rinse the filter under running water.
Use a soft brush and mild soap for stuck-on residue when permitted.
Rinse thoroughly.
Reinstall every piece in the correct position.
Lock the filter securely before running the dishwasher.

Do not use a wire brush, rough scouring pad, or sharp tool on the filter mesh. Damage may allow food particles to recirculate through the dishwasher.

Make sure the filter is fully seated. A loose or incorrectly installed filter can affect cleaning performance and may allow debris to reach other parts of the machine.

Inspect the Filter Well and Pump-Cover Area

After removing the filter, look into the accessible area below it.

You may find:

Food pieces
Paper labels
Fruit pits
Toothpicks
Small bones
Broken glass
Grease buildup

Remove loose debris carefully. Do not force your fingers into openings or move pump components unless the owner’s manual specifically tells you how.

Some machines have an accessible pump cover that can be removed for cleaning. Others do not. Follow the exact instructions for your model.

If you hear grinding or find broken glass near the pump, stop using the dishwasher until the area has been safely inspected.

Check the Spray Arms

Dishwasher spray arms need clear openings to distribute water properly.

Remove a spray arm only if the manual identifies it as an owner-removable part.

Inspect the small holes for:

Food particles
Mineral deposits
Paper fibers
Seeds
Grease
Small fragments of debris

Rinse the arm and clear accessible openings using the manufacturer’s recommended method. Do not enlarge the holes with a drill, knife, or thick metal tool.

Spin the spray arms by hand after reinstalling them. They should rotate freely without hitting a tall utensil, pan, rack component, or detergent dispenser.

A dishwasher may leave food behind when the spray arms are blocked or unable to turn.

Wipe the Door Seal and Edges

The main wash spray does not always reach the outer door edges and gasket.

Use a soft cloth with warm water and a small amount of mild dish soap when the manufacturer permits it.

Wipe:

Around the rubber gasket
The lower door edge
Corners beside the hinges
The detergent-dispenser area
The handle
Control-panel edges
The lip where the door closes

Use a soft brush or cotton swab for narrow creases, but avoid pushing water into electrical controls.

Do not pull, stretch, or aggressively scrub the gasket. A damaged seal can lead to leaks.

Dry the area afterward, especially where moisture remains trapped when the door is closed.

Clean the Racks and Utensil Basket

Food residue, grease, labels, and mineral deposits can collect on the racks and basket.

Remove them only when the manual allows it. Wash accessible areas with warm water, mild soap, and a non-abrasive cloth or brush.

Check:

Rack wheels
Folding tines
Utensil-basket openings
Corners beneath handles
Tracks and rollers
Areas around damaged rack coating

Do not use harsh abrasives on coated racks. If the protective coating has worn away and metal is rusting, look for a manufacturer-approved repair kit or replacement part.

Make sure rack wheels and tracks move properly before reinstalling them.

Wipe Visible Interior Residue

Use a soft sponge or microfiber cloth with warm water to remove loose grease or residue from the tub walls.

Pay attention to:

The lower corners
The area around the detergent dispenser
The bottom of the door
The filter surround
Areas beneath the lower rack

Stainless-steel and plastic dishwasher interiors can have different care instructions. Avoid steel wool, abrasive powder, oven cleaner, and products not labeled for dishwasher interiors.

Do not spray a general household cleaner throughout the machine. Residue could remain where dishes are washed.

Run the Manufacturer-Approved Cleaning Cycle

After cleaning the filter and accessible parts, run the cleaning or maintenance cycle recommended in your manual.

Depending on the model, the manufacturer may recommend:

A dishwasher-cleaning tablet
A specific machine-care product
A descaling product
An empty hot cycle
A dedicated maintenance program

Follow the cleaner label and dishwasher instructions exactly.

Place the product in the location specified by the manufacturer. Some cleaners go in the detergent dispenser, while others are placed in the bottom of the empty tub or used in an inverted bottle.

Do not use extra dishwasher detergent during the cleaning cycle unless the instructions tell you to.

Be Careful With Vinegar

Some dishwasher manufacturers provide instructions for using measured white vinegar in certain models. Others recommend a formulated dishwasher cleaner instead.

Do not pour vinegar into the dishwasher automatically.

Acidic products may affect certain rubber parts, seals, metal components, or interior finishes when used too strongly or too frequently. Always check your specific owner’s manual.

Never use vinegar at the same time as:

Chlorine bleach
A bleach-containing dishwasher detergent
Another dishwasher cleaner
An unknown cleaning product

Combining acidic products with chlorine bleach can release dangerous chlorine gas.

Use one cleaning method at a time, follow its directions, and complete the required rinse before using another product.

Be Careful With Bleach

Bleach is not appropriate for every dishwasher.

Do not use chlorine bleach in a dishwasher with a stainless-steel interior or stainless-steel components unless the manufacturer explicitly says it is safe. Chlorine can damage or discolor some metals.

If your manufacturer allows bleach for a particular plastic-interior model, follow the exact measurement and cycle instructions.

Never combine bleach with:

Vinegar
Ammonia
Descaling solution
Rust remover
Acidic cleaner
Other household cleaning products

Do not improvise a stronger mixture because the dishwasher smells bad.

Do Not Put Hand Dish Soap in the Dishwasher

Ordinary liquid hand-dishwashing soap creates excessive foam in an automatic dishwasher.

That foam can leak from the door, interfere with washing, and leave a large cleanup job on the floor.

Use only detergent labeled for automatic dishwashers during normal cycles.

Mild hand dish soap may be suitable for washing a removable filter or rack by hand when the manufacturer permits it, but rinse the part thoroughly before reinstalling it.

Check the Detergent Dispenser

Residue can collect around the dispenser lid and prevent it from opening or closing properly.

With the dishwasher cool and empty:

Wipe away loose detergent.
Clean around the lid with a damp cloth.
Check that the latch moves freely.
Remove any item that may block the dispenser during a cycle.
Allow the area to dry.

Do not force a stuck dispenser with a sharp tool.

Using too much detergent can contribute to residue, particularly in homes with softer water. Follow the detergent instructions and dishwasher manual instead of filling the dispenser automatically to its maximum level.

Check the Rinse-Aid Dispenser

Rinse aid can help water drain from dish surfaces and may improve drying, but it should be used according to the machine and product instructions.

Check for:

An empty dispenser
Spilled rinse aid around the opening
Incorrect adjustment
A lid that does not close properly

Wipe spills promptly. Excess rinse aid can create foam or leave a film.

If dishes look cloudy, determine whether the cause is detergent residue, hard-water minerals, glass etching, poor rinsing, or incorrect loading before changing several settings at once.

Load the Dishwasher So Water Can Circulate

A clean dishwasher can still perform poorly when it is overloaded or incorrectly loaded.

Avoid:

Nesting bowls tightly together
Blocking spray arms with tall utensils
Placing large trays in front of the detergent dispenser
Stacking items so water cannot reach them
Allowing lightweight plastic pieces to fall into the heater or filter area
Pointing heavily soiled surfaces away from the spray

Scrape off bones, labels, seeds, and large food pieces before loading. Whether dishes need rinsing first depends on the machine, detergent, cycle, and manufacturer guidance.

Why the Dishwasher May Still Smell After Cleaning

A persistent odor may come from somewhere other than the tub.

Possible causes include:

Debris remaining beneath the filter
A blocked drain hose
A dirty garbage disposal
A sink-drain problem
Standing water
A plumbing installation issue
A dead pest near or beneath the appliance
Melted plastic on a heating component
An electrical fault
Mold or moisture outside the dishwasher

If the smell resembles burning plastic, overheated wiring, or chemicals, stop the cycle and disconnect power safely. Contact a qualified technician.

Do not cover an electrical or mechanical odor with a scented cleaning product.

Why Dishes May Still Have Residue

If the dishwasher is clean but dishes still come out dirty, check:

Spray arms can rotate
Spray openings are clear
The filter is locked in place
The correct cycle is selected
Water is reaching the proper temperature
Detergent is fresh and appropriate
The dispenser is not blocked
Items are loaded with space between them
The home’s water hardness is considered
The water inlet is functioning
The dishwasher drains fully

Repeated gritty residue may indicate that the filter is dirty, damaged, or incorrectly installed.

A white chalky film may be related to hard water, detergent amount, or mineral buildup rather than food debris.

How Often Should You Clean a Dishwasher?

The best schedule depends on usage, filter design, household habits, and the manufacturer’s instructions.

A practical routine may look like this:

After each load

Remove food that falls into the tub.
Check that nothing is blocking the spray arms.
Leave the door slightly open for a short time when the manufacturer permits it, allowing moisture to escape.

Weekly

Wipe the door edges and gasket.
Check the filter area for visible debris.
Clean the utensil basket when needed.
Inspect the spray arms.

Monthly or as directed

Clean a removable filter.
Run the manufacturer-approved maintenance cycle.
Check the drain area.
Wipe the dispenser and rack tracks.

Households that run several loads daily or leave heavy food debris on dishes may need to check the filter more often.

Common Dishwasher-Cleaning Mistakes

Running a cleaner without checking the filter

A cleaning tablet may help with mineral and grease buildup, but it cannot remove a piece of glass, label, seed, or bone blocking the filter.

Using several cleaners together

Mixing vinegar, bleach, detergent, descaler, or another product can create dangerous reactions or damage the machine.

Forcing the filter out

Filter removal varies by model. Check the manual first.

Reinstalling the filter incorrectly

A loose filter may allow debris to circulate or reach the pump.

Using abrasive tools

Rough pads can damage filter mesh, plastic parts, stainless steel, coatings, and seals.

Ignoring standing water

A dishwasher that repeatedly fails to drain may have a plumbing, hose, pump, or installation problem.

Using ordinary hand dish soap

It creates excessive foam and may leak from the appliance.

When to Call for Service

Contact the manufacturer or a qualified appliance technician when:

The dishwasher repeatedly fails to drain.
Water leaks from the door or underneath the appliance.
An error code returns after basic maintenance.
The pump makes grinding or unusual noises.
The spray arms do not receive water.
The dishwasher smells like burning plastic or electrical insulation.
Broken glass may have reached the pump.
The filter housing is damaged.
The machine trips a breaker.
Dishes remain dirty after the filter, loading, detergent, and spray arms have been checked.

Do not open electrical housings or remove built-in plumbing connections unless you are qualified to do so.

Final Takeaway

When a dishwasher smells bad or leaves residue, start with the parts that trap and move dirty water.

Check the bottom of the tub, clean the removable filter, inspect the spray arms, wipe the door seal, and run the maintenance cycle recommended for your model.

Use only one approved cleaning product at a time. Do not treat vinegar or bleach as universal dishwasher cleaners, and never mix them with each other or with unknown products.

Regular filter checks and a simple monthly maintenance routine can often prevent odor and residue before they become persistent problems.

FAQ

What is the first thing I should clean in a smelly dishwasher?

Check the bottom of the tub and the dishwasher filter. Food debris trapped in or around the filter is a common source of odor.

Can I put vinegar in my dishwasher?

Only when your dishwasher manufacturer permits it and provides instructions. Do not combine vinegar with bleach, bleach-containing detergent, descaler, or another cleaning product.

How often should I clean the dishwasher filter?

Follow your model’s manual. Some manufacturers recommend checking or cleaning removable filters approximately monthly, while frequency may vary based on use and the amount of food debris entering the machine.

Why is there grit on my dishes after washing?

The filter may be dirty, damaged, loose, or installed incorrectly. The spray arms may also be blocked, or the dishwasher may be overloaded.

Can I use bleach to clean a dishwasher?

Only when the manufacturer explicitly permits it. Avoid bleach in stainless-steel interiors unless approved, and never mix it with vinegar, ammonia, descaler, or other cleaners.

Why does my dishwasher smell even after I cleaned it?

Check for standing water, a clogged drain hose, disposal or sink-drain odors, debris beneath the filter, melted plastic, or an installation problem. Persistent mechanical or electrical smells require service.