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How to Clean a Garbage Disposal (and Fix One That Won't Work)

By Mike Holt, NJ Master Plumber · May 9, 2024 · 3 min read · Updated November 1, 2026

Quick answer

Turn the disposal off and unplug it, scrub the rubber splash guard, then grind a handful of ice cubes with coarse salt under cold running water. For odors, follow with baking soda and vinegar, rinse, and grind a few lemon peels. Never put your hand inside the disposal.

Difficulty
Simple. Keep your hands out and the power disconnected
Time
15 minutes
You need
Ice, coarse salt, baking soda, vinegar, scrub brush, tongs

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A garbage disposal stays cleaner with a quick cleaning every couple of weeks. Much of the bad smell comes from food stuck under the rubber splash guard, and many "broken" disposals are only jammed or tripped. Here's how to handle both safely.

How to clean a garbage disposal

Step 1: Turn it off and unplug it

Garbage disposal cord unplugged from the outlet under a kitchen sink

Switch the disposal off at the wall switch, then unplug it under the sink or turn off its breaker. Never put your hand inside a disposal, even when it's off. Use tongs or pliers to pull anything out.

Step 2: Scrub the splash guard

Black rubber disposal splash guard with an old toothbrush beside it in the sink

Lift the flaps of the black rubber splash guard and scrub the underside with an old toothbrush or bottle brush and a little dish soap. This is where most of the smell comes from. If your guard lifts out, take it out and wash it in the sink.

Step 3: Grind ice and salt

Ice cubes, coarse salt and lemon wedges in a garbage disposal opening

Plug the disposal back in. Drop in about two cups of ice and half a cup of coarse salt. Run cold water and turn the disposal on until the grinding stops. The ice and salt scour buildup off the grinding parts.

Step 4: Deodorize with baking soda and vinegar

Baking soda and vinegar fizzing in a kitchen sink drain

With the disposal off, pour in half a cup of baking soda, then a cup of white vinegar. Let it fizz for 10 minutes, then flush with hot tap water while you run the disposal for a few seconds.

Step 5: Finish with citrus peels

Lemon and orange peels in a kitchen sink drain

Grind a few lemon, lime or orange peels with cold water running. It freshens the smell. Then rinse for 15 seconds.

Skip bleach and chemical drain cleaners. They're hard on the disposal's seals and on older pipes.

Garbage disposal not working? Try this first

Step 1: It's silent: press the reset button

Underside of a garbage disposal showing the red reset button and the hex socket

Turn the switch off. Find the small red button on the bottom of the unit and press it until it clicks. Wait a few minutes if the motor feels hot. Turn the water and switch back on. Still silent? Check that it's plugged in and look at the breaker status. If the breaker or outlet has tripped, call us.

Step 2: It hums but won't turn: free the jam

Hex key inserted in the socket at the bottom of a garbage disposal

Disconnect the power first: turn it off and unplug it, or switch off the breaker if it's hard-wired. Put a 1/4-inch hex key (Allen wrench) in the socket in the center of the bottom of the disposal. Many disposals come with one. Work it back and forth until it turns a full circle freely. Shine a flashlight in from the top and pull out anything stuck with tongs. Never use your hand.

Step 3: Reset and test

Press the reset button, plug it back in, run cold water and turn it on. If it runs normally, you're done.

When to repair or replace it

If the disposal leaks from the bottom, keeps tripping its reset button, or hums even after you free it, the motor or seals are worn out. Replacing it is usually the better value than repairing it. We install and replace garbage disposals. Written upfront flat-rate pricing options. You choose. See our garbage disposal page, or call 908-873-6686.

If the sink backs up even when the disposal runs fine, the clog is in the drain pipe. That's a drain cleaning job.

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Stop and call us if

  • It leaks from the bottom or from the pipe connections.
  • It hums and won't turn even after you free it with the hex key.
  • The reset button keeps popping out, or the breaker has tripped.
  • Water backs up into the sink even with the disposal running.

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Mike Holt
About the author

Michael Holt

Owner and operator of Plumbing Doctor, NJ Master Plumber (Lic. #36BI01345600) and U.S. Marine Corps veteran.

More about Mike

FAQ

Questions we get about this

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How do I reset a garbage disposal?

Turn it off at the switch, wait a few minutes for the motor to cool, then press the small red reset button on the bottom of the unit until it clicks. Turn the water and the switch back on. If it still won't run, look at the breaker status and call us.

Why does my garbage disposal hum but not turn?

Something may be jamming it, or the motor may be stuck. Disconnect the power first. Then put a 1/4-inch hex key in the socket in the center of the bottom of the unit and work it back and forth until it turns freely. Remove any object with tongs, never your hand, then press reset and try again.

How do I get rid of a garbage disposal smell?

Food stuck under the rubber splash guard causes most of the smell. Scrub the guard with a brush and dish soap, grind ice and salt, then baking soda and vinegar, and finish with lemon or orange peels. Running cold water for 15 to 30 seconds after each use keeps the smell from coming back.

What should you not put in a garbage disposal?

Grease and cooking oil, coffee grounds, pasta, rice, potato peels, fibrous food like celery and corn husks, bones, fruit pits, and anything that isn't food. These either jam the blades or build up in the drain pipe.

How long does a garbage disposal last?

Many disposals last somewhere around 8 to 15 years, but it varies with the model and how hard they're used. If yours leaks from the body, trips its reset button often or is noisy and slow, replacing it is usually the better choice.

Leaking pipe right now?

Shut off the water first if you can reach the valve safely, then call us, day or night.

908-873-6686

Outside regular hours and on holidays, emergency service requires a $250 upfront emergency fee. When paid, the standard $49 service fee is waived. During regular hours there is no emergency fee. Additional repairs are quoted before work begins. We respond immediately upon contact; dispatch and arrival depend on availability and location.

Do this now

  1. Shut the main valve. Usually where the water line enters, near the meter.
  2. Stay clear of electricity. Don't enter standing water or touch electrical controls near the leak.
  3. Open a low faucet to drain the pipes and take pressure off the leak.
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