How to Clean a Can Opener (The Most Forgotten Kitchen Tool)

Can openers are one of the most bacteria-laden tools in the kitchen — yet most people never clean them. The cutting wheel slices through can lids and picks up metal shavings, food residue, and moisture every single use. Here's how to clean one properly.

Why Can Openers Get So Dirty

Every time you open a can, the cutting wheel and gear mechanism collect tiny food particles, metal dust, and moisture. Left uncleaned, this creates a breeding ground for bacteria and rust — which then transfers directly into your food the next time you use it.

What You'll Need

Holikme Bottle Brush Set — narrow brushes reach into the gear mechanism and around the cutting wheel
An old toothbrush
Mild dish soap and warm water
White vinegar (for rust and sanitizing)
Microfiber Cleaning Cloths — for drying

Step-by-Step: How to Clean a Manual Can Opener

Step 1: Rinse Immediately After Use

Rinse the can opener under warm running water right after use. Open and close the handles while rinsing to flush water through the cutting mechanism.

Step 2: Scrub the Cutting Wheel and Gear

Apply dish soap to an old toothbrush or narrow bottle brush. Scrub the cutting wheel, the gear teeth, and the area where they meet — this is where food and metal residue accumulate most. Open and close the handles as you scrub to expose all surfaces.

Step 3: Scrub the Handles

Wipe down the handles with a soapy sponge or cloth. Handles pick up grease and food from your hands during use.

Step 4: Rinse Thoroughly

Rinse under warm running water, opening and closing the mechanism to flush out all soap and loosened residue.

Step 5: Dry Completely

This is critical. Dry the cutting wheel and mechanism thoroughly with a microfiber cloth. Any moisture left in the gear mechanism causes rust. Leave open to air dry fully before storing.

How to Remove Rust from a Can Opener

Soak the cutting end in undiluted white vinegar for 10–15 minutes.
Scrub with an old toothbrush to remove loosened rust.
Rinse thoroughly and dry completely immediately.
If rust is severe or on the cutting wheel itself, replace the can opener — rust contaminating food is a health risk.

How Often Should You Clean a Can Opener?

After every single use — no exceptions. A 30-second rinse and scrub after each use prevents buildup entirely. A deep clean with a toothbrush should be done weekly if you use it frequently.

Frequently Asked Questions

Can I put a can opener in the dishwasher?

Some can openers are dishwasher safe — check the manufacturer's label. However, the dishwasher doesn't always reach into the gear mechanism effectively. Hand scrubbing with a toothbrush is more thorough.

My can opener leaves black residue on can lids. What is that?

That's a combination of metal shavings from the cutting wheel and oxidized food residue. It means the can opener needs an immediate deep clean. This residue can fall into your food.

How do I know when to replace a can opener?

Replace when the cutting wheel is rusty, dull, or leaves excessive metal shavings; when the gear mechanism is stiff or skips; or when it can no longer be cleaned effectively.

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