Rust is a common problem that can affect can openers, especially if they are not properly maintained. Rust can cause the can opener to become difficult to use, and it can also contaminate the food that is being opened. There are a few different ways to remove rust from a can opener, depending on the severity of the rust.
For light rust, you can try using a vinegar solution. To do this, simply soak a cloth in vinegar and then wrap it around the rusty area. Let the cloth sit for a few hours, and then scrub the rust away with a brush. If the rust is more severe, you may need to use a commercial rust remover. Be sure to follow the directions on the product label carefully.