How to Fix a Dishwasher That Smells Bad

A smelly dishwasher is one of the most common appliance complaints in Australian homes. The good news is that it is almost always fixable with a thorough clean and a few simple habits. Here is exactly what causes dishwasher odours and how to get rid of them permanently.

Why Does Your Dishwasher Smell?

Dishwasher odours are caused by food debris, grease, mineral deposits and bacteria building up inside the machine. The main problem areas are:

• The filter and filter housing
• The door seal (gasket)
• The spray arms
• The inside walls of the tub
• Stagnant water trapped in the sump

Step 1: Clean the Filter

The filter is usually the main culprit. Most dishwashers have a cylindrical filter located at the bottom of the machine. To clean it:

1. Remove the bottom rack.
2. Twist and lift out the cylindrical filter. Some models have a flat mesh screen beneath it — remove that too.
3. Rinse both parts under hot running water.
4. Use an old toothbrush and dish soap to scrub away any trapped food or grease.
5. Reassemble and lock the filter back in place.

This should be done every two to four weeks to prevent odours from developing.

Step 2: Clean the Door Seal

The rubber seal around the door traps food and moisture. Wipe it thoroughly with a damp cloth and a small amount of white vinegar. Pay attention to the folds and grooves where debris accumulates.

Step 3: Clean the Spray Arms

Remove the spray arms (they usually unscrew or unclip) and rinse them under running water. Use a toothpick to clear any blocked holes. Reattach them once clean.

Step 4: Run a Deep Clean Cycle

Place a dishwasher-safe bowl filled with two cups of white vinegar on the bottom rack. Run the dishwasher on the hottest cycle. The vinegar breaks down grease and mineral deposits and neutralises odours.

After this cycle, sprinkle one cup of baking soda across the bottom of the dishwasher and run a short hot cycle. The baking soda deodorises and brightens the interior.

Step 5: Use a Dishwasher Cleaner Monthly

Products like Finish Dishwasher Cleaner dissolve grease and limescale that regular washes miss. Use one every month to keep the interior clean and odour-free.

Preventing Odours Going Forward

• Scrape food off plates before loading (you don't need to rinse).
• Clean the filter every two to four weeks.
• Leave the door slightly ajar after each cycle to allow moisture to escape.
• Use a rinse aid to prevent water spots and reduce damp residue.
• Run a hot wash at least once a week.

When to Call a Technician

If odours persist after a thorough clean, there may be a drainage issue — standing water in the sump creates the perfect environment for bacteria. A blocked drain hose or faulty pump may need professional attention.

If your dishwasher is old and repairs are becoming frequent, it may be time to upgrade. Oceania Appliances stocks a wide range of dishwashers across all sizes and budgets, with free delivery across Sydney. Contact us for advice on the best model for your home.