Why Does My Dishwasher Smell Even After I Run It Empty?
Running a dishwasher empty doesn’t fix the smell, because the smell usually comes from places an ordinary cycle doesn’t clean: food packed into the filter, grime on the door gaskets and the front of the tub floor, and residue left by low-temperature cycles. Clean those by hand, then run one hot cycle with a dishwasher cleaner.
The order below deals with those sources one at a time.
Step 1: Take the filter out and rinse it
The filter is the mesh cylinder and screen in the tub floor that catches food so it isn’t sprayed back onto the dishes. Food caught there can stay until you remove it. Whirlpool lists “unpleasant odors from the appliance” as one of the signs the filter needs cleaning.
- How: on Whirlpool models, turn the upper filter assembly a quarter-turn counterclockwise, lift it out, then lift out the lower filter. Rinse both under running water and reinstall until they lock. Bosch says to use a soft brush and nothing abrasive.
- How often: Whirlpool says about once a month, or every two weeks with heavy use. If you run a load every day, consider the two-week schedule.
Check the area under the filter too. That’s where water collects, which brings us to the next question.
Step 2: Check the standing water, and know what’s normal
Many owners see water in the bottom, assume the drain is clogged, and start taking things apart. Whirlpool says a small amount of standing water in the filter area is normal. That’s water about halfway up the filter area. It keeps the seals from drying out, and it drains at the start of the next cycle and is replaced with clean water.
More than that points to a draining problem, and Bosch notes that trapped waste water can cause odors. Bosch lists three causes:
- A blocked filter. Do Step 1 first.
- A kinked or twisted drain hose.
- A blocked drain pump.
If your dishwasher drains through the garbage disposal, a clogged disposal can back water up too. Run the disposal before you start a dishwasher load. If the disposal hums but won’t spin, here’s how to free it safely. Never put your hand inside a disposal.
Step 3: Wipe what the spray never hits
Whirlpool’s odor guidance names two places to clean by hand with a sponge and warm water:
- The door gaskets, all the way around the rubber seal, including the folds.
- The bottom front of the tub, under the door, where Whirlpool says food soil tends to collect.
Step 4: Run one hot cleaning cycle
Now the cleaning cycle has something to work on. Two details make it work where an ordinary empty run didn’t:
Make it hot. Bosch lists insufficient rinse temperature as a cause of bad smells and says to use a higher-temperature program. Its maintenance wash runs at a minimum of 65°C (149°F). Whirlpool says to run the kitchen faucet until the water is hot before you start, because the dishwasher otherwise needs extra time to heat the water to cleaning and sanitizing temperature. Frigidaire recommends a water heater set to at least 120°F.
Use a cleaner, or vinegar occasionally.
- Dishwasher cleaner: Whirlpool says to put one affresh tablet in the detergent dispenser, add no detergent, and run the dishwasher empty.
- Vinegar: Whirlpool’s version is 2 cups (500 mL) of white vinegar in the lower rack, a normal cycle with the heated dry option off, and no detergent. Whirlpool also warns that vinegar is an acid and that using it too often could damage the dishwasher. Save it for occasional use rather than every week.
Never add bleach to a cycle that has vinegar or an acid-based cleaner in it. Poison Control warns that mixing bleach with acids releases toxic chlorine gas. Cleaners sold for lime scale are often acidic, so check the label. If you use more than one product, run them in separate cycles with a plain rinse cycle in between.
How often: a schedule that keeps the smell from coming back
Brands differ on intervals, so your manual wins over this table. Where they disagree, both are listed.
| When | Task | Source |
|---|---|---|
| Every load | Run the kitchen tap until hot before you start | Whirlpool, Frigidaire |
| Every load | Scrape food scraps off plates before loading | General practice; it keeps the filter from loading up |
| Every 2 weeks (heavy use) to monthly | Remove and rinse the filter | Whirlpool |
| Each time you clean the filter | Wipe the door gaskets and the front of the tub floor | Whirlpool’s odor steps (pairing them with the filter is our suggestion) |
| Monthly (Whirlpool) or every 4–6 months (Bosch) | Cleaning cycle with a dishwasher cleaner; Bosch’s runs at 149°F or higher | Whirlpool, Bosch |
| Occasionally, not as a habit | 2-cup vinegar rinse | Whirlpool |
Loading also affects how much food ends up in the filter. See the dishwasher loading mistakes worth fixing.
When the smell comes with a white film
Heated hard water forms calcium carbonate deposits. The U.S. Geological Survey classifies water above 120 mg/L (as calcium carbonate) as hard and above 180 mg/L as very hard. Whirlpool says extremely hard water deposits can damage a dishwasher, and it strongly recommends a water softener at 15 grains of hardness or more. Your water utility’s report gives your hardness, sometimes in mg/L and sometimes in grains, so check which unit it uses. Frigidaire adds that rinse aid helps prevent spots and residue.
When it isn’t the dishwasher
If the kitchen smells even when the dishwasher hasn’t run, check the sink drain and disposal before you blame the machine. A smell that’s strongest at the sink points there, not to the dishwasher.
FAQ
I cleaned everything and it still smells. Now what?
Check whether water is sitting above the halfway point of the filter area after a cycle. If it is, the filter, the drain hose, or the pump isn’t letting water out, and the smell will keep returning until that’s fixed. If the filter and hose are clear, a blocked pump is the remaining cause on Bosch’s list.
Can I just use bleach?
Not on top of vinegar or an acidic cleaner, ever. The combination releases chlorine gas. None of the manufacturer steps above call for bleach.
Sources
- How to Clean the Dishwasher Filters and Water Remains in Filter Area (Whirlpool) — filter interval and steps, odor as a filter sign, normal standing-water level
- Cleaning the Dishwasher (odors) and Cleaning the Interior (Whirlpool) — door gaskets, tub front, 2-cup vinegar rinse and its limit, monthly cleaner, 15-grain softener advice
- Water Temperature – Dishwasher (Whirlpool) — run the tap hot before starting a load
- Best Cleaning Results (Frigidaire) — 120°F minimum water heater setting, rinse aid
- Dishwasher Smells Bad and Dishwasher Not Draining (Bosch) — low rinse temperature, 65°C maintenance wash every 4–6 months, blocked filter, pump, or kinked hose
- Hardness of Water (USGS) — hardness categories
- Chlorine Gas (Poison Control) — never mix bleach with vinegar or other acids
Written and reviewed by peter.bae for Hearth & Habit · Last reviewed October 11, 2026
Comments
Post a Comment