If there is inflammation or black dirt on the cat's ear, it is not normal. Generally, if the dirt is only on the surface of the ear, the owner can remove it for the cat by himself, but if it is in the ear canal, he should go to the hospital and ask the veterinarian to remove it.
Preparing your cat's ear cleaning supplies: baby make-up oil, cotton swabs
First of all, when checking your cat's ears, don't take anything, including cotton swabs, into your cat's ears, because cat ears are very soft and sensitive.
Then, when you see the black dirt on the cat's ear, you can use a cotton swab dipped in baby oil to wipe away all the dirt inside the ear. Because cats' ear canals are L-shaped, handle them carefully when cleaning. If you scrub too hard, you may make your cat uncomfortable or even injured. Be sure to move gently and clean in a circular motion.
Be sure to check that the cotton swabs are clean before cleaning your cat's ears, or else bacteria will enter the ear canal with the swabs and cause inflammation.
About 90% of cats will have a rejection reaction when cleaning their ears. So when you wash the cat's ears, you need to do a good job of calming it down. First of all, before cleaning the cat's ears, you can feed the cat some snacks and stroke the cat's head appropriately, so that the cat develops a sense of closeness to the owner.