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Why Your Dishwasher Smells — and How to Fix It

It is almost always food, not a broken machine

That musty or rotten smell is decaying food trapped where you can't see it — most often the filter in the tub floor. Whirlpool's official product help is blunt about it: remove the drain filter at the bottom, rinse it under hot water, and clean it at least once a month. Many owners don't know their dishwasher even has a removable filter.

The free deep-clean routine

1) Pull the bottom rack and twist out the filter; rinse off the sludge and scrub it with a soft brush. 2) Wipe the spray arms and clear the little nozzle holes. 3) Wipe the door gasket and edges where gunk hides. 4) Run an empty hot cycle with two cups of white vinegar in a bowl on the bottom rack to neutralize odor. This costs nothing and resolves the large majority of dishwasher smells.

Check the drain path

If the smell persists, look at drainage: a sagging drain hose that doesn't loop up high under the sink lets dirty water back-flow, and a clogged air gap or disposal connection traps standing water that turns sour. Standing water in the tub bottom is both a smell source and a drainage clue.

When it is more than a cleaning

If you've cleaned the filter, gasket, and drain loop and it still smells — especially with standing water that won't clear — you may have a failing drain pump or a check valve letting waste water back in. That is a real repair ($150–$350). When the free routine doesn't fix it, have a vetted local pro check the drain pump and plumbing. Find dishwasher repair in your city.

Frequently Asked Questions

1. Why does my dishwasher smell bad? Almost always trapped food in the filter, on the spray arms, or in the door gasket — or sour standing water from a drainage issue. Cleaning the filter monthly fixes most cases.
2. How do I get rid of dishwasher odor? Clean the filter and spray arms, wipe the gasket, and run an empty hot cycle with two cups of white vinegar on the bottom rack. Check the drain hose loop if the smell persists.

Sources

1. Whirlpool Product Help — Removing Odors in your Dishwasher
2. Whirlpool Product Help — Cleaning the Dishwasher Filter
3. r/Appliances (owner discussions)

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