What it is: A pre-wash treatment to be applied to dry hair before shampooing.What it does: Achieve your hair goals with this BHA exfoliating hair treatment designed to cleanse and purify your scalp. The pre-wash treatment removes excess oil and product buildup, helping to reduce scalp flakiness, itchiness, redness and sensitivity. It gently exfoliates the scalp to remove dead skin cells while reducing flakiness, itchiness and sensitivity. It clarifies the scalp and eliminates product buildup. It