The mud in the navel is a local metabolic waste that is not cleaned regularly and forms dirt. It is recommended that patients regularly clean the belly button sludge to avoid local sludge accumulation more local infection, resulting in progressive aggravation of the original local infection. First, if the amount of sludge in the navel is small, soapy water can be used for local soaking and cleaning to achieve a better cleaning effect. Second, if the amount of sludge in the navel of the patient is large, and the water of the sludge is completely absorbed, the adhesion between the sludge and the skin is more dense. At this time, the use of soap and water cleaning effect is not good, it is recommended that patients use 75% alcohol cotton balls, local immersion in the navel for 10-20 minutes, can promote the softening of the sludge, fall off, and then give cotton balls or sterile cotton swabs, take local cleaning can achieve better results in removing the navel sludge.