Revolution Beauty Haircare Salicylic Acid. Clarifying Scalp Serum for oily dandruff 50 ml. Revitalize your hair and scalp while you sleep with Revolution Beauty Haircare Salicylic Acid Clarifying Scalp Serum for Oily Dandruff. The overnight hair treatment is designed to nourish the skin and help balance excess scalp oil.Enriched with salicylic acid, the scalp serum gently removes build-up, while tea tree oil helps soothe and relieve. To enhance your hair care routine, the leave-in hair serum helps replenish moisture while promoting a healthy, revitalized shine.Vegan, cruelty-free, without sulfates and silicone.