How to Clean a Smelly Dishwasher
Dishwasher odour almost always has the same three sources: a clogged or dirty filter, mineral and food buildup in the spray arms, and mould or mildew growing in the door gasket. Addressing all three clears the smell and improves wash performance.
Step 1: Clean the Filter (Most Important)
Most modern dishwashers have a manually-cleanable filter at the base of the tub. Many people never clean it — it fills with food particles and becomes the primary odour source.
- Remove the bottom rack
- Locate the filter assembly at the base of the dishwasher — it typically twists out (refer to your manual for your model)
- Remove the filter and rinse under hot water
- Scrub with a soft brush and dish soap to remove any grease or food buildup
- Rinse and reinstall
Step 2: Clean the Door Gasket
- Inspect the rubber gasket around the door frame — this area traps food debris and develops mould
- Wipe the gasket with a cloth dampened with white vinegar, paying attention to the fold at the bottom
- Use a toothbrush or cotton swabs to get into the fold of the gasket
- Wipe dry
Step 3: Clear the Spray Arms
- Remove the spray arms (usually unscrew or pull off — check your manual)
- Hold the spray arm under a tap and run water through it — look for blockage in the spray holes
- Use a toothpick to clear any blocked spray holes
- Rinse and reinstall
Step 4: Run a Cleaning Cycle
- Vinegar cycle: Place a cup of white vinegar in a dishwasher-safe bowl on the top rack. Run a hot water cycle. The vinegar cuts mineral deposits and neutralizes odour.
- Baking soda cycle: After the vinegar cycle, sprinkle 1 cup of baking soda on the bottom of the tub and run a short hot cycle. The baking soda deodorizes and brightens the interior.
- Commercial dishwasher cleaner: Products like Affresh dishwasher cleaner are formulated for the job — use monthly.
Preventing Odour
- Rinse dishes before loading to remove large food particles
- Run the dishwasher every 2–3 days at minimum — a stagnant dishwasher with food residue develops odour quickly
- Leave the door slightly open after a cycle finishes — allows the interior to dry and prevents mildew growth
- Clean the filter monthly
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