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Dishwasher Smells Bad? Clean It, Then Know When to Call a Technician

By / October 14, 2026

Most dishwasher odors come from a dirty filter and food residue, and you can usually fix them today. Pull out the bottom rack, remove and clean the filter, then run an empty hot cycle with a cup of distilled white vinegar on the top rack, followed by a short rinse with some baking soda on the tub floor. If the smell is sewage-like or returns after cleaning, stop running the dishwasher and have a technician take a look.

TL;DR:

  • Clean the filter and spray arms monthly, wipe the gasket weekly, and leave the door ajar after cycles to limit residue, moisture, and mold.
  • Run an empty hot cycle with 1 cup distilled white vinegar on the top rack, then rinse with 1 cup baking soda on the tub floor.
  • A sewage odor that persists after checking the air gap and disposal points to drain plumbing; call a plumber instead of repeating cleaning cycles.
  • Call a licensed technician and stop using the dishwasher if water remains, backups recur, drain noises turn unusual, or burning or melted plastic smells persist.
  • Use diluted bleach only on plastic or coated interiors; choose a citric acid cleaner for stainless steel because bleach can discolor it.
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Table of Contents

What causes dishwasher odors and what the smell is telling you

A dirty or clogged filter is the most common culprit. Food particles collect in the sump area at the bottom of the tub, and over time they break down and create a sour, rotten smell that circulates through every wash. Consumer Reports points to a dirty filter as the source of most odor complaints.

Other sources show up once the filter checks out clean:

  • Soap scum, grease, and mineral buildup coating the interior walls and spray arms
  • Mold or mildew hiding in the folds of the door gasket or inside the detergent dispenser
  • A clogged drain, kinked hose, or blocked air gap or garbage disposal connection that lets plumbing odors back into the tub
  • Melted plastic or a burning smell from a utensil that slipped too close to the heating element

The type of smell usually tells you where to look first. A fishy or rotten odor points to trapped food or a dirty filter, while a sewage-like smell often traces back to the drain line, air gap, or disposal connection rather than the dishwasher itself, according to Whirlpool. A burning or melted-plastic smell is a different problem entirely and calls for immediate attention, as The Spruce notes.

Quick inspect-and-identify checklist: what to look at now

Before you clean anything, spend five minutes figuring out exactly where the smell is coming from. A quick inspection saves you from scrubbing parts that were never the problem.

  1. Open the dishwasher, pull the bottom rack, and smell the filter and sump area directly.
  2. Lift out the filter and check for trapped food, grease film, or standing water underneath it.
  3. Spin the spray arms by hand and check each hole for blockages or hardened residue.
  4. Open the detergent dispenser and look for stuck, caked residue that never dissolved.
  5. Run a finger along the door gasket creases, checking for black or pink mold spots.
  6. Look under the sink at the garbage disposal, air gap cover, and drain hose for kinks, backflow, or debris.

Pro Tip: Always turn off power to the dishwasher at the breaker before reaching near the heating element or any electrical component during an inspection.

Step-by-step cleaning routine that fixes most odors

Once you know where the smell is coming from, this sequence handles the vast majority of cases without any special tools.

  1. Remove the filter, rinse it under hot water, and soak it for a few minutes if grease has built up.
  2. Scrub the filter mesh with a soft brush and hot, soapy water, then reinsert it so it locks into place correctly.
  3. If your model allows it, remove the spray arms and clear each hole with a toothpick or a thin wire, then rinse and reattach them.
  4. Wipe down the door edges, gasket lips, and detergent dispenser with a damp cloth, paying attention to the creases where grime collects.
  5. For visible mold on a plastic or coated interior, a diluted bleach solution works well; stainless interiors should use a citric-acid cleaner instead, since bleach can discolor stainless steel.
  6. Place a dishwasher-safe bowl with 1 cup of distilled white vinegar on the top rack and run an empty hot cycle.
  7. Sprinkle 1 cup of baking soda across the tub floor and run a short hot rinse cycle to finish.

Whirlpool recommends this vinegar-then-baking-soda sequence as a reliable fix for everyday odors, and following it monthly helps prevent the smell from coming back.

A dirty filter is one of the most frequent causes of dishwasher odor, and Consumer Reports recommends cleaning it monthly to keep odors and mold from building back up. Skipping that monthly check lets grease and food particles accumulate until a single wash can’t clear them.

Homeowner lifts debris-coated dishwasher filter for cleaning

Avoid bleach on stainless steel tubs, and if your machine doesn’t have a sanitize cycle, a commercial dishwasher cleaner or descaler used regularly can help handle mineral buildup that vinegar alone can’t touch.

Preventing odors: a simple maintenance schedule

A little routine upkeep keeps the smell from ever coming back, and it takes only a few minutes a week.

  • Daily: Scrape plates before loading, and avoid letting wet dishes sit in the tub for hours after a cycle ends.
  • Daily: Crack the door open after the cycle finishes so moisture can escape instead of feeding mold.
  • Weekly: Wipe the gasket and glance at the filter well for early signs of buildup.
  • Monthly: Deep-clean the filter and spray arms, then run the vinegar and baking soda treatment or a commercial cleaner.
  • Monthly: Add a descaler if you have hard water, since mineral deposits trap odor-causing residue.

Loading habits matter just as much as cleaning. Avoid overloading the racks so water and detergent can reach every surface, use the detergent amount recommended for your machine rather than guessing, and keep the rinse aid reservoir filled to help water sheet off instead of pooling and leaving residue behind.

Pro Tip: Running hot water at the kitchen sink for a few seconds before starting the dishwasher helps the first fill arrive hot instead of lukewarm, which improves how well detergent dissolves and rinses away.

When to call a technician for plumbing or electrical signs

Some odors signal a problem that goes beyond cleaning. If a sewage-like smell persists after you’ve cleaned the filter and checked the air gap and garbage disposal connection, the issue is likely in the drain line rather than the dishwasher itself, as iFixit explains.

Stop using the dishwasher and call a licensed technician if you notice any of the following:

  • Standing water that doesn’t drain between cycles
  • Repeated backups from the sink or disposal into the dishwasher
  • Loud, unusual noises during the drain cycle
  • Any burning or melted-plastic smell that continues after you’ve removed the item near the heating element

A technician inspects the drain pump, hose connections, air gap, and electrical components with the right tools to avoid causing further damage. Our plumber for dishwasher repair page covers how we handle drain and disposal issues that go beyond a simple filter cleaning.

What years of appliance calls taught us about dishwasher smells

We often see recurring patterns: filters that haven’t been cleaned in months, racks loaded too tightly for water to circulate, and the wrong amount of detergent dissolving into a sticky film instead of rinsing clean. Most of these issues can be resolved without a service visit. A five-minute filter check and a monthly vinegar cycle handle the majority of common dishwasher odor problems, helping to avoid unnecessary repair calls. When the smell keeps coming back despite a clean filter and a proper cycle, that’s usually when onsite diagnostics make more sense than another round of guesswork.

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Get professional help when the smell won’t quit

When a dishwasher smell traces back to a worn seal, a failing drain pump, or wiring near the heating element, a trained eye catches what a home fix can’t, and gets it diagnosed correctly the first time. Our appliance repair services cover dishwashers and the plumbing connections tied to them, with licensed technicians who handle the job safely and leave you with a fix built to last.

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If you ever smell burning plastic or notice anything electrical acting strangely, unplug the unit and stop using it right away. Book a visit through our appliance repair services page and we’ll get a technician out to sort it properly.

FAQ

How do you get rid of a bad smell in the dishwasher?

Clean the filter thoroughly, then run an empty hot cycle with 1 cup of distilled white vinegar on the top rack followed by a short rinse with 1 cup of baking soda on the tub floor, a sequence Whirlpool recommends for everyday odors. Wiping the gasket and detergent dispenser at the same time clears out the spots that commonly hold onto mold and residue.

How do I get rid of the sewer smell in my dishwasher?

A sewage-like smell usually points to the drain line, air gap, or garbage disposal connection rather than the dishwasher interior, according to iFixit. Check the air gap cover for debris first, since that’s an owner-safe fix, and call a plumber if the smell persists once it’s clear.

Why does my dishwasher stink but the filter is clean?

A clean filter doesn’t rule out soap scum on the interior walls, mold in the door gasket, or buildup inside the spray arm holes, all of which Popular Mechanics flags as common hidden sources of odor. A clogged drain hose or air gap can also cause lingering smells even when the tub itself looks spotless.

How do you stop a dishwasher from smelling?

Clean the filter monthly, wipe the gasket weekly, and run a vinegar-and-baking-soda cycle or a commercial cleaner on a monthly schedule, a routine Consumer Reports recommends to prevent mold and residue from building back up. Cracking the door after each cycle to let moisture escape also keeps mold from taking hold between washes.

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