What to Do If Your Dishwasher Smells

Last updated: 3 August 2025

Step 1: Empty the Filter

One of the most common causes of bad smells in a dishwasher is a dirty or clogged filter. Food particles get trapped over time and start to rot. Remove the bottom rack, take out the filter (usually a twist-off unit under the lower spray arm), and rinse it under hot water. Use an old toothbrush to scrub any stubborn grime.

Step 2: Clean the Spray Arms

Blocked spray arms can lead to poor cleaning, which contributes to smells. Check for any food debris inside the spray holes. You can use a toothpick or cocktail stick to clear them, then rinse the arms thoroughly before placing them back.

Step 3: Wipe the Door Seals and Walls

Mould and grime often build up around the rubber seals and the inside edges of the door. Wipe these areas with a cloth soaked in warm, soapy water or a vinegar solution. Don’t forget the bottom edge of the door and around the hinges.

Step 4: Run a Cleaning Cycle

Once everything is scrubbed and reassembled, run the dishwasher empty on its hottest setting. Add a dishwasher cleaning tablet or place a bowl of white vinegar on the top rack. This will help remove lingering odours and limescale.

Step 5: Check the Drain Hose

A kinked or clogged drain hose can cause water to back up, resulting in nasty smells. Make sure the hose isn’t blocked or damaged. You may need a plumber if you suspect a deeper drainage issue.

Step 6: Prevent Future Smells

  • Scrape plates before loading (but don't fully rinse — modern dishwashers are designed to work with some residue)
  • Clean the filter every 1–2 weeks
  • Leave the door slightly open after cycles to let it dry out
  • Run a hot cycle with a cleaning tablet monthly
  • Use dishwasher salt and rinse aid if recommended for your model

Frequently Asked Questions

It's not recommended, especially for stainless steel interiors, as it can cause damage. White vinegar or specialist dishwasher cleaners are safer options.
Hidden buildup in the filter, spray arms, or hose can still cause odours. Make sure all parts have been fully cleaned and run a hot cycle with vinegar or a cleaner.
Not usually, but persistent odours may indicate mould or bacteria growth, which should be addressed to ensure hygiene and machine efficiency.