Can openers can get pretty grimy over time, which is unsanitary but also keeps the opener from operating its best. Fortunately, you can fix the problem with a little wax paper.
Even if you're good about washing your can opener regularly, bits of food and flakes of metal can be hard to get out. But as ever-helpful blog One Good Thing by Jillee points out, you can fold a piece of wax paper a few times, clamp down on it with your can opener, and give it a few twists. The paper not only helps dislodge anything stuck up under the blades, the wax coating will lubricate the mechanism at the same time.
16 Smart Uses for Wax Paper [One Good Thing by Jillee ]