IGK First Class Charcoal Detox Dry Shampoo, Wet Brush, Amika Hair Dryer Work in small sections throughout your head. Focus more product on the more oily parts. Wait 30 seconds for the product to absorb the oil. Brush through to remove the oil from the scalp. Use some hot air for extra volume and shine. Enjoy a coffee with all the time you saved not washing your hair!