Act Acre Dry Itchy Scalp System (Scalp Renew & Scalp Detox). This best selling treatment duo is designed to hydrate the scalp and relive a dry itchy scalp. The Scalp Detox Cleansing Oil is a pre-cleanse oil for breaking down product build-up. Scalp Renew is a rebalancing gentle salicylic acid scalp exfoliator. Relive sensitive scalp with the bestselling exfoliator and detox.