Black stuff in the belly button, which is produced because the body’s metabolic waste has not been cleaned up for a long time, depending on the amount of the body and the dryness of the knot, you can use different ways to clean. The methods are as follows: 1. If there is a small amount of black hard material in the navel, you can use soapy water cotton balls for 2-3 times of local cleaning. 2. If there is a large number of black impurities in the navel, and is relatively dry and tightly bonded to the skin, this time the use of soap and water can not be completely removed. You can use ethanol cotton balls or active iodine cotton balls in the local soaking 3-5 minutes, can make the black hard substances in the navel soften, conducive to rapid removal. It is recommended to regularly clean the waste in the belly button to prevent the accumulation of waste, resulting in localized bacterial infections, try not to use your hands to clean the waste in the belly button, so as not to cause bacterial infections in the hands.