Quick answerPull out the filter at the bottom of the tub — it's almost certainly caked with old food. Scrub it in hot soapy water, wipe the door gasket, then run an empty hot cycle with a cup of vinegar on the top rack. The smell is trapped food rotting, not a broken machine.
What you'll need
- White vinegar (1 cup)
- Baking soda (1/2 cup, optional second cycle)
- Dish soap
- Old toothbrush
- Microfiber cloth
- Rubber gloves
Step-by-step
- Empty the dishwasher completely. Racks can stay in, but no dishes. You want full access to the bottom of the tub.
- Remove and clean the filter. Twist out the cylindrical filter at the bottom (it usually unlocks with a quarter turn). You'll probably find it coated in gray sludge — that's your smell. Scrub it in hot soapy water with the toothbrush, getting into the mesh. Rinse it clean.
- Clean the filter housing. While the filter's out, wipe inside the empty housing and check the drain area for bones, glass shards, or labels. Fish out anything that doesn't belong — carefully, in case of glass.
- Scrub the spray arms. The spinning arms have small holes that clog with food and limescale. Wipe them down and poke clear any blocked holes with a toothpick. If an arm lifts off easily, rinse it in the sink.
- Wipe the door gasket and edges. Run a damp cloth along the rubber seal around the door, especially the bottom edge where water pools. Also wipe the inside of the door itself — the bottom corners collect grime that never gets washed.
- Run the vinegar cycle. Put a dishwasher-safe cup filled with white vinegar on the top rack. Run the hottest, longest cycle with nothing else inside. The hot vinegar cuts grease and deodorizes the whole interior.
- Optional baking soda cycle. Sprinkle half a cup of baking soda across the bottom and run a short hot cycle. This is the deodorizing finisher. Skip it if the smell is already gone — one cycle is often enough.
- Check the drain setup. If your dishwasher drains through a garbage disposal, run the disposal — a clogged disposal backs smell into the dishwasher. Also check the drain hose has a high loop (it should rise up before connecting) so sink water can't flow back in.
<div class="safety"> <strong>🛑 Stop and call a pro if:</strong> <ul> <li>There's standing water in the bottom that won't drain after a cycle — that's a pump, drain, or garbage disposal blockage, not a cleaning issue.</li> <li>You see water leaking from under or around the unit during cycles — a hose, seal, or valve may have failed.</li> <li>The smell is distinctly like burning plastic or electrical — turn it off at the breaker and call a tech, don't run more cycles.</li> <li>Never mix bleach with vinegar in the dishwasher. If you want a bleach sanitize cycle, run it alone on an empty machine.</li> </ul> </div>
DIY vs pro cost
| Option | Typical cost |
|---|---|
| DIY | $2–$5 |
| Pro dishwasher service | $150–$250 |
Printable checklist
- [ ] Dishwasher completely empty
- [ ] Filter twisted out and scrubbed clean
- [ ] Filter housing wiped, debris removed
- [ ] Spray arm holes checked and cleared
- [ ] Door gasket and bottom edge wiped
- [ ] Hot vinegar cycle run (cup on top rack)
- [ ] Optional baking soda cycle run
- [ ] Garbage disposal run, drain hose loop checked
Related guides
- Washing Machine Not Draining? How to Fix It
- Dryer Not Heating? Troubleshooting Guide
- How to Clean a Washing Machine (Fix the Smell)
Frequently asked questions
Why does my dishwasher smell like fish or wet dog?
That's decomposing food trapped in the filter — usually bits of protein and fat that sat in warm water. The filter scrub fixes it. If the smell returns within days, something's preventing drainage and food is sitting in standing water.
Can I use bleach to sanitize my dishwasher?
You can run an empty hot cycle with half a cup of bleach, but check your manual first — some stainless-steel tubs discolor with bleach. And never combine it with vinegar. For most smell problems, the vinegar cycle is enough and carries no risk.
How often should I clean the filter?
Monthly if you don't rinse dishes before loading; every 2–3 months if you do. It takes five minutes once you know the twist motion, and it's the single most effective dishwasher maintenance there is.
Should I leave the dishwasher door open after a cycle?
Cracking it open helps the interior dry and prevents that damp closed-up smell, same principle as the washing machine. Just watch out for the door as a trip hazard in a busy kitchen.
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