This heavy-duty charcoal dry shampoo allows you to go even longer between washes, even after workouts. Detoxifying charcoal powder lifts dirt and build up while absorbing oil and sweat. IGK First Class Charcoal Detox Dry Shampoo is a deeply cleansing dry shampoo that absorbs oil + eliminates odors. With Charcoal Powder plus 7 percent Active Cleansing Powders. You have: Oily hair plus scalp.