Why Dishwasher Smells Bad: Causes and Fixes
Quick answer
A smelly dishwasher is often caused by trapped food particles or mold. Clean the filter, rinse aid dispenser, and interior to eliminate odors. Run a cleaning cycle with vinegar or a dishwasher cleaner.
Confirm the symptom
- Notice a foul odor when opening the dishwasher
- Smell lingering after a wash cycle
- Dishes have a musty or moldy smell
Tools and prep
- Rubber gloves — Protect hands from cleaning solutions
- White vinegar — Natural disinfectant and deodorizer
- Baking soda — Absorbs odors and cleans surfaces
- Soft brush — Scrub filter and hard-to-reach areas
- Microfiber cloth — Wipe surfaces without scratching
- Dishwasher cleaner — Commercial cleaner for tough buildup
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Prep & safety
- Wear rubber gloves to protect your hands from cleaning solutions.
- Unplug the dishwasher to ensure safety during cleaning.
Step-by-step troubleshooting
Check the filter
Do: Locate and remove the filter at the bottom of the dishwasher.
Observe: Filter is clogged with food particles and debris.
Means: Clogged filter is causing odor.
Next: Clean the filter with a soft brush and water.
Clean the filter
Do: Scrub the filter with a soft brush and water.
Observe: Filter is clean and free of debris.
Means: Filter is now clean.
Next: Rinse the filter thoroughly and reinstall it.
Clean the interior
Do: Wipe down the interior with a microfiber cloth and baking soda.
Observe: Interior surfaces are clean and odor-free.
Means: Interior is now clean.
Next: Run a cleaning cycle with vinegar or dishwasher cleaner.
Clean the rinse aid dispenser
Do: Remove the rinse aid dispenser and clean it with warm water.
Observe: Dispenser is free of residue and buildup.
Means: Dispenser is clean.
Next: Reinstall the dispenser and refill with rinse aid.
Run a cleaning cycle
Do: Place a cup of white vinegar in a dishwasher-safe container on the top rack and run a hot water cycle.
Observe: Vinegar neutralizes odors and cleans the interior.
Means: Dishwasher is now deodorized.
Next: Check for lingering odors after the cycle completes.
Check for standing water
Do: Inspect the bottom of the dishwasher for standing water.
Observe: Standing water is present.
Means: Water is causing mold or mildew.
Next: Dry the interior thoroughly with a towel.
Inspect the drain hose
Do: Check the drain hose for clogs or kinks.
Observe: Hose is clear and free of obstructions.
Means: Drain is functioning properly.
Next: Reconnect the hose securely.
Test the dishwasher
Do: Run a normal wash cycle with a load of dishes.
Observe: Dishwasher completes the cycle without odors.
Means: Problem is resolved.
Next: Monitor for recurring odors in future cycles.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged filter | Trapped food particles cause mold and odor. | High | Low | Filter |
| Dirty interior | Food residue and soap scum build up over time. | High | Low | None |
| Clogged rinse aid dispenser | Residue buildup prevents proper function. | Medium | Low | Rinse aid dispenser |
| Standing water | Water promotes mold and mildew growth. | Medium | Low | None |
| Blocked drain hose | Clogs prevent proper drainage and cause odors. | Medium | Medium | Drain hose |
| Hard water buildup | Mineral deposits create a breeding ground for bacteria. | Low | Medium | Descaler or water softener |
| Old or expired rinse aid | Stale rinse aid can cause unpleasant odors. | Low | Low | Rinse aid |
| Improper loading | Food particles fall into the drain and cause odors. | Low | Low | None |
Parts matching
When replacing parts, ensure they match your dishwasher model and specifications.
- Filter: model number and size
- Rinse aid dispenser: compatible with your dishwasher model
- Drain hose: length and diameter
- Descaler: compatible with your dishwasher or water system
Check your dishwasher's manual for specific part numbers and compatibility information.
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When to call a pro
- Odors persist after multiple cleaning attempts
- Dishwasher leaks or doesn't drain properly
- Unusual noises accompany the odor
- Standing water cannot be removed manually
- Parts are damaged and need replacement beyond basic troubleshooting
FAQ
How often should I clean my dishwasher filter?
Clean the filter every 1-2 months to prevent clogs and odors.
Can I use bleach to clean my dishwasher?
Avoid using bleach as it can damage the dishwasher's components. Use vinegar or a dishwasher cleaner instead.
Why does my dishwasher smell like rotten eggs?
A rotten egg smell is often caused by a buildup of bacteria or a problem with the water supply. Clean the dishwasher thoroughly and check the water inlet valve.
How do I prevent future odors in my dishwasher?
Regularly clean the filter, use rinse aid, and ensure proper drainage to prevent future odors.