Dishwasher Smells Bad? How to Find and Clear the Odor
Quick answer
A dishwasher that smells bad almost always has rotting food trapped in the filter, the drain, or the spray arms. Pull and rinse the bottom filter, scrub the door gasket, and check that the drain hose isn't clogged or improperly looped. A vinegar-and-baking-soda clean cycle removes lingering odor once the trapped debris is gone.
A foul or musty smell when you open the dishwasher means decaying food and grease have built up somewhere water can't fully rinse away. The good news is that most odor sources are easy to reach and clean yourself. This guide walks you through the filter, gasket, spray arms, and drain so you can find the buildup, clear it, and keep your dishwasher smelling fresh.
1. Remove and clean the bottom filter
The number-one odor source is the cylindrical filter in the floor of the tub. Food particles collect there and rot between washes. Twist it out (most newer dishwashers have a removable filter assembly), rinse it under hot running water, and scrub the mesh with an old toothbrush and a little dish soap. Wipe out the sump area underneath where the filter sits. Doing this monthly prevents most smells and improves cleaning performance at the same time.
2. Clean the door gasket and edges
Grime, grease, and mold collect in the rubber door seal and along the bottom edge of the door, areas the wash spray never reaches. These spots trap food and develop a musty smell. Wipe the entire gasket with a cloth dampened in warm soapy water or a 50/50 vinegar solution, getting into the folds. Don't forget the lip just inside the door where debris settles. A clean, dry gasket also seals better and prevents leaks.
3. Clear the spray arms and check the drain
Spin the spray arms and look at the small jet holes; food and mineral buildup clog them, leaving water stagnant. Soak the arms and poke holes clear with a toothpick. Then check the drain: a slow or smelly drain often means food is lodged in the hose or the garbage-disposal connection. Run your disposal and confirm the dishwasher drain line is properly clamped with a high loop, which prevents dirty water from siphoning back into the tub.
4. Run a deodorizing clean cycle
Once the filter, gasket, and arms are clean, deodorize the interior. Place a bowl of white vinegar on the top rack and run a hot cycle, then sprinkle a cup of baking soda across the bottom and run a short hot rinse. This cuts grease and neutralizes odor. For ongoing freshness, scrape plates before loading, run a hot wash weekly, and leave the door cracked open after cycles so the interior dries instead of staying damp.
When to Call a Specialist
If the smell returns quickly after a thorough cleaning, you may have standing water from a partial drain clog, a failing drain pump, or a check valve that lets dirty water back into the tub. These point to a drainage fault rather than simple buildup. A specialist technician can inspect the pump and drain path. Call Commonwealth Appliance Repair at (202) 327-0059 for upfront pricing and same-day service.
Frequently Asked Questions
Why does my dishwasher smell like rotten eggs?
A rotten-egg or sewage smell usually means food is decaying in the filter or drain, or that the drain hose lacks a high loop and is letting wastewater back into the tub. Clean the filter, scrub the gasket, and confirm the drain line loops up high before connecting to the disposal or sink.
How often should I clean my dishwasher filter?
Pull and rinse the filter at least once a month, more often if you don't pre-rinse dishes or run heavy loads. A quick rinse under hot water and a scrub of the mesh takes two minutes and prevents the trapped-food odor that causes most dishwasher smells.
Will vinegar get rid of dishwasher odor?
Vinegar helps, but only after you remove the source. Clean the filter and gasket first, then run a hot cycle with a bowl of white vinegar on the top rack to cut grease and neutralize smell. Vinegar alone won't fix odor if rotting food remains trapped in the filter.
Rather have us handle it?
Same-day dishwasher repairacross Northern Virginia & DC. Upfront pricing, 90-day warranty, specialist technicians.
Call (202) 327-0059Related