Perfect Hair Day Dry Shampoo. The #1 dry shampoo brand*. A dry shampoo that actually cleans hair by absorbing oil, sweat, and odor while also adding body and texture. Shake can extremely well for maximum cleaning results. Hold canister six to ten inches away from dry hair. Section hair thoroughly and apply product in a sweeping motion to dirty/oily areas. Wait 30 seconds for the powders to activate and cleanse. Then remove by massaging and shaking at roots with fingers or brush hair. Apply more if needed, make sure to shake again.