How to Clean a Garbage Disposal — Remove Odour and Buildup

Garbage disposals develop a persistent sour or rotten smell from food residue that clings to the rubber splash guard, the grinding chamber walls, and the underside of the rubber flaps — areas that the water spray during grinding doesn't clean. The smell comes from bacteria feeding on the food film. Here's how to eliminate it.

Safety First: Never Reach Into a Disposal

Always turn off the disposal at the switch (and ideally at the circuit breaker under the sink) before cleaning. Never reach into the disposal chamber, even when it's off — the blades are sharp.

Step 1: Clean the Splash Guard

The rubber splash guard — the black rubber flaps at the drain opening — is the number one source of disposal odour. Food residue accumulates on the top and underside of the flaps and the rubber ring they're attached to.

1. With the disposal off, use a small scrub brush or old toothbrush with dish soap to scrub the top surface of the splash guard flaps
2. Use a gloved hand to fold back each flap and scrub the underside — this is where the most buildup is and what most people miss
3. Scrub the rubber ring around the opening
4. Rinse by running cold water

Step 2: Ice and Salt Scrub

Ice and coarse salt physically scrub the grinding chamber walls and blades when the disposal is run:

1. Pour a cup of ice cubes into the disposal
2. Add ¼ cup of coarse salt (rock salt or kosher salt)
3. Turn on the disposal and run with cold water for 30–60 seconds

The ice and salt combination physically abrades the chamber walls and sharpens the blades as a side benefit.

Step 3: Deodorize with Baking Soda and Vinegar

1. Pour ½ cup of baking soda into the disposal
2. Pour ½ cup of white vinegar on top — it will fizz
3. Let sit for 10–15 minutes without turning on the disposal
4. Run cold water and turn on the disposal for 30 seconds to flush

Step 4: Citrus Peel Finish

Run a handful of citrus peels (lemon, orange, or lime) through the disposal with cold water. The natural citrus oils coat the chamber walls and leave a fresh scent. This is a finish step, not a cleaning method — it won't address real buildup, but it maintains freshness after cleaning.

How Often

• Splash guard scrub: weekly
• Ice and salt scrub: monthly
• Full baking soda/vinegar deodorize: monthly or whenever odour develops

Maidless's standard kitchen clean includes wiping around the disposal drain area. Book a Toronto house cleaning — HST included.