If you have an infected nipple piercing, there are a few things you can do to clean it. First, make sure that the piercing is completely dry. If it is not, you can put some soap on a cloth and use it to clean the piercing. Second, if the Piercing is wet, you can put some water on a cloth and use it to clean the piercing. Finally, if the Piercing is dirty, you can use a mild soap and water to clean it.