Olaplex No. 4C Bond Maintenance Clarifying Shampoo is an advanced clarifying shampoo powered by Olaplex's exclusive broad-spectrum clarifying system that delivers a powerful deep cleanse - removing buildup and impurities and clears the way for healthier hair. When you use it: Use weekly as a part of an at home cleansing routine. Can be used prior to hair repair treatments to optimise performace.