Because ears are a primary collecting point of dirt and debris, it is important to check your cat's ears once every other week. If your cat's ears need cleaning, use a cotton swab moistened with hydrogen peroxide or another product suggested by your veterinarian. Also, you can ask your veterinarian to show you the proper cleaning procedure if you are unsure. Remember to be gentle. Never go deeper into the ear than what you can see and never apply the peroxide directly into the ear.