A cat’s ears that are clean but scratched often may be caused by ear mites, external parasites, dry skin, or trauma. You need to carefully check whether there are parasites or trauma in and around the cat’s ears. If there is trauma, you need to report it in time. Help the cat treat the wound; if there is no trauma, you can use ear cleaning solution to clean the cat's lower ear canal, and then help the cat with external deworming. At the same time, you should also improve the cat's diet and feed it some vegetables.