Most of the dirt inside the belly button has to be softened to some degree before it can be treated. You can special wet oil or alcohol, iodine vapors and other local wet compresses, so that the hard dirt softened, and then gently cleaned with a sharp object. A good cleaning effect can then be achieved. You can also take a bath, soak in warm water rinse, followed by a cotton swab dipped in non-irritating body wash or alcohol, iodine, etc., gently wipe the navel, soften the dirt, so that it is no longer clinging to the surface of the skin, and then rinse away with warm water after wiping the dirt, to prevent germs from breeding. If the local odor, there is no need to be anxious, you can use the purple potion in the right amount applied to the navel and the surrounding area, if you feel the navel inflammation, you should seek medical attention in a timely manner.