Smelly Dishwasher? If It Smells Bad, Clean the Source and Get Rid of It

A smelly dishwasher usually has food debris, grease, or dirty water trapped where a normal wash does not fully reach. The smell and its timing are the fastest clues. A rotten-food smell often starts in the filter. A musty smell points to a damp seal or crevice. A sewage-like smell that grows stronger while draining may involve the drain hose or kitchen plumbing. Clean the source before adding a cleaner.

If the dishwasher smells bad after that first check, do not keep running products through it. A cleaner can lift a greasy deposit, detergent film, and some limescale. It cannot clear a solid clog, repair a pump, or make an electrical fault safe.

Quick dishwasher smell check: what do you notice?

Use the table to match the smell to the first place worth checking. This avoids pulling apart clean sections of the appliance or repeating a wash cycle that cannot reach the cause.

Where the smell appears also matters. A smell released when you first open the door usually comes from food or moisture inside the machine. A smell that appears only during draining is more likely to involve dirty water, the drain hose, or the sink connection. If the odour transfers to a clean dish, recheck the filter position and water flow.

Why does a dishwasher smell bad?

Several problems can produce similar bad odours. Start with the clue that best matches what you see, smell, and hear.

1. Food particles are trapped in the dishwasher filter

The filter catches scraps before they reach the pump and drain. Even one food particle can smell bad after it stays damp for several days. A rotten or sour dishwasher smell that is strongest near the bottom usually makes the filter the first place to inspect.

2. Grease and detergent deposits sit inside the machine

Grease, dirt, and detergent can form a sticky deposit inside the dishwasher. That film holds food and moisture, which allows the smell to return after a normal wash. Chalky marks suggest limescale is present too, but the bad smell usually comes from residue held around it rather than from the mineral itself.

3. The door seal and hidden crevices stay damp

The main spray may not reach the lower door lip, hinge area, or every fold in the seal. Dirt can remain in each narrow crevice. If the smell is strongest around the dishwasher door, wipe those areas before blaming the drain.

4. A drain clog holds dirty water

Dirty water across the bottom of the machine is different from the small amount of clean water some models keep in the filter well. A sewage or wet-dog smell may indicate a clog, kinked drain hose, sink connection problem, or plumbing issue. Check the appliance manual before removing covers or disconnecting a hose.

5. Food sits on dishes before a wash cycle

One dirty dish is enough to make a closed dishwasher smell if it sits there for days. Food on plates placed in the bottom rack may be closest to the filter, so the smell can seem as if it comes from the machine itself. Run the dishwasher regularly rather than leaving heavily soiled dishes sealed inside.

6. Mildew grows in a damp area

A musty smell, dark spotting, or slimy residue around the seal can indicate mildew or mould. Clean visible growth and find out why the area stays damp. For a focused method, see how to clean mould in a dishwasher and help prevent it from returning.

7. A hot or burning smell signals a different problem

A plastic item or food particle can fall near a dishwasher’s heating element and create a melted-plastic or charred smell. Stop the cycle and allow the dishwasher to cool completely before removing only loose, visible material. Whirlpool’s dishwasher guidance recommends checking around the heating element only after the appliance has cooled.

If there is smoke, the smell returns, or it is not clearly caused by a loose item, switch off the dishwasher at the power source where it is safe to do so. Do not use it again until it has been checked by a qualified appliance technician. This follows general fire-safety guidance reproduced in an archived Energy Safe Victoria publication, which advises switching off an appliance that produces smoke or a burning smell and leaving it unused until it has been checked.

What to clean first when your dishwasher smells bad

Use this short first-response clean on the three places most likely to hold a bad smell.

1. Clean the filter and remove food debris

Switch off the machine and remove the bottom rack. Follow the manual to lift out the filter. Tip loose food into the bin, rinse the filter with warm water, and use a soft brush to scrub greasy residue. A torch is a useful inspection tool for the open area beneath it. Remove only loose debris you can see, and never reach in blindly because glass may be present.

2. Wipe the seal and inside edges

Use a damp, non-scratch sponge to wipe the lower door lip, detergent dispenser, and folds in the seal. A soft brush can reach a narrow crevice, but do not use a sharp metal tool. Keep water and cleaning spray away from the latch, controls, and electrical parts.

3. Run one cleaner wash cycle

After you clean the filter and visible surfaces, place one Dishwashing Machine Cleaner tablet at the bottom of the empty dishwasher. Run a regular wash cycle, then let the machine air-dry. Use one cleaning product only and follow both the pack and appliance instructions.

Need to remove and clean the spray arms, inspect every removable part, or deep clean the whole appliance? Follow the complete seven-step dishwasher cleaning guide.

What a dishwasher cleaner can and cannot fix

A dishwasher cleaner works on residue carried through the machine by water. It cannot solve every reason a dishwasher smells bad.

• A cleaner may help with grease film, detergent deposits, light limescale, and bad odours caused by residue in places a cloth or sponge cannot reach.

• A cleaner will not remove a label, bone, piece of glass, or other solid debris trapped in the filter or drain area.

• A cleaner will not clear a blocked hose, repair a pump, correct kitchen plumbing, or make a burning electrical fault safe.

• If the same strong smell returns as soon as the cycle ends, stop adding product and investigate the matching source instead.

What if the dishwasher smell comes back?

A returning smell is useful evidence. Note when it returns before you clean anything again.

• Smell returns when the door opens: recheck the filter, food under the bottom rack, the door seal, and any damp crevice.

• Smell returns only while draining: use the drain checks in the dishwasher manual. A technician or plumber may need to inspect the drain hose, sink connection, or household plumbing.

• Dirty water remains at the bottom: do not rely on another cleaner cycle. A clog, pump, or hose problem needs drainage troubleshooting.

• The smell is on clean dishes: make sure the filter is locked in place, the spray arms can turn, and dirty water is leaving the machine.

• There is a burning smell, leak, error code or unusual noise: stop using the appliance and arrange a qualified service check.

How to prevent bad odours in a dishwasher

A few smell-specific habits can stop food and moisture from building up between regular cleans.

• Scrape large pieces of food into the bin before loading the dishwasher.

• Do not leave heavily soiled dishes sealed inside the machine for several days.

• Check the filter when you see debris, get gritty dishes or notice the first stale smell.

• Wipe the lower door lip and seal when dirt or grease appears.

• Let an empty dishwasher air-dry after a cleaner cycle when it is safe in your kitchen and the manual allows the door to stay slightly open.

Frequently Asked Questions About Smelly Dishwashers

Can white vinegar get rid of dishwasher smell?

White vinegar may be allowed for some models, but it is not a universal dishwasher cleaner. Follow the exact amount, position, and wash cycle in your manual. Do not pour vinegar onto a seal or combine it with another product.

Can I use soap or soda to clean inside the dishwasher?

Do not use hand dish soap in an automatic dishwasher. Whirlpool Product Help explains that hand dish soap creates excess suds, which can push water out of the machine and cause leaking or poor wash performance. Use only detergent or cleaning products designed for automatic dishwashers.

Because cleaning instructions vary between models, use bicarb soda only if the manual for your dishwasher provides a method.

Why does my dishwasher smell like rotten eggs?

Start by checking for old food in the filter and drain area. If the smell returns during each wash or drain phase, the drain hose, sink connection, or kitchen plumbing may be involved. Do not mask a repeated sewage-like smell with fragrance.

Why does the dishwasher smell worse while it runs?

Warm water and moving air can release odour from grease, food, or dirty water. If the smell peaks only when the machine drains, move beyond surface cleaning and check the drainage guidance in the manual.

Which tool should I use to clean a smelly dishwasher?

Use gloves, a soft brush, a non-scratch sponge, and a torch. These tools are enough for the filter, seal, and visible drain area. Avoid wire brushes, scouring pads, and sharp objects that could damage a filter, spray jet, or seal.

Why do clean dishes still carry a bad smell?

A loose filter can allow a food particle to circulate during the wash. Blocked spray arms or dirty water that does not drain can also leave an odour on each dish. Recheck those parts and arrange service if the problem repeats.

Get rid of dishwasher smell at the source

Start with the smell, its timing, and the closest likely source. Clean the filter, wipe the seal, and remove visible food or debris before running a product. For residue, grease, and light limescale left after that manual clean, use Lucent Globe's Dishwashing Machine Cleaner. If the bad smell returns at once, investigate the drain or appliance instead of repeating the same wash.