Cats have very sensitive ears, so handle them gently. About once a week, swab the ear area with a cotton ball dipped in baby oil, removing any dark, waxy residue. Don’t use a cotton swab, as you could easily damage his eardrum if he moves and the swab goes deeper into his ear.
If your cat scratches his ears a lot, he may have ear mites. You should also be concerned if you see excessive waxy, dark residue in his ears, or if his ears have a bad odor to them. If this is the case, take him to the veterinarian as soon as possible. She can accurately diagnose the problem and provide a medication to eliminate it.