Cleaning Tips3 min read

How to Clean a Dishwasher Door Seal — Where Mould Actually Hides

The rubber door gasket on a dishwasher traps food particles, moisture, and mould in its folds. Here's how to clean it properly and prevent odour.

M
Maidless

The dishwasher door seal — the rubber gasket that runs around the inside perimeter of the door — is one of the most reliably neglected spots in a kitchen. It's out of sight when the door is closed, but its folded edges trap food particles, water, and eventually mould. A dirty door seal is the most common source of musty dishwasher odour. Here's how to clean it.

What You'll Find

Open the dishwasher door fully and look at the rubber gasket along the door edge. Run your finger along the inside of the fold — you'll typically find a combination of food debris, grey or black mould, and mineral deposit buildup, particularly along the bottom where debris settles.

Cleaning the Door Seal

  1. Mix a solution of equal parts white vinegar and warm water in a bowl
  2. Dip an old toothbrush (or small scrub brush) into the solution
  3. Scrub along the entire gasket, paying particular attention to the folds and creases where the rubber doubles over — this is where mould accumulates
  4. Use a damp cloth to wipe away the loosened debris as you go
  5. For black mould spots that don't respond to vinegar: apply a small amount of bleach-based bathroom cleaner (like Tilex) to the toothbrush, scrub, and rinse thoroughly with a clean damp cloth. Avoid getting bleach on stainless steel interior parts of the dishwasher.
  6. Finish by wiping the entire gasket with a clean damp cloth to remove all cleaning solution residue

The Bottom of the Door Interior

The strip at the very bottom of the door interior — below the gasket level — is another accumulation point. This area often has standing water and food residue. Wipe it out with a cloth each time you notice buildup; it doesn't get cleaned during a wash cycle.

How Often

  • Full gasket scrub: monthly
  • Quick wipe of the gasket and door bottom: every 1–2 weeks, or whenever you clean the dishwasher filter

Preventing Mould

  • Leave the dishwasher door slightly open after a cycle finishes — this allows the interior to dry rather than creating a humid sealed environment
  • Run an empty hot cycle with a cup of white vinegar monthly to clean the interior and gasket naturally

Maidless's deep cleaning service includes wiping the dishwasher door seal and exterior. Book a Toronto deep clean — HST included.

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