Washing your hair regularly gets all of the dirt and old oils out of your hair and scalp. Ideally you should wash hair weekly, and try to apply a moisturizing shampoo it only to the scalp, and lather very gently, this uncloges pores. After washing your hair, never rub it with a towel. Just gently squeeze it with the towel in your hand, almost as if scrunching. There should be no pulling or yanking whatsoever.