Use white or apple-cider vinegar and a toothbrush to scrub away the rust, then rinse off the vinegar thoroughly. Dry the opener with a hair-dryer (be careful, though — the metal may get hot), making sure to get into all of the crevices.

Is it okay to use rusty can opener?

Rust on the actual blade will also make it harder to open cans. Some severe cases of rust can cause the can opener to seal itself shut completely, so you can’t even open it. Using a rusty can opener is also a serious health concern because it can cause the rust to fall into the can and your food.

When should I replace my can opener?

If you use your safety can opener several times a week, it’s likely to only last one or two years before becoming too dull to work effectively. By contrast, a traditional can opener can last many years before wearing out. Plus, safety can openers typically cost twice as much as traditional models.