Do you get a whiff of mildew every time you turn your head and you don’t know where it’s coming from? Well, it’s coming from you lol. It is very important that you thoroughly dry your sew in after working out, swimming and shampooing it. Leaving it wet will cause a mildew and odor caused by damp hair. If possible it is recommended that you sit under a dryer until your natural hair is completely dry.