What makes healthy hair dull, discolored, dry, unmanageable, or oily? Buildup. Nº^.4C Bond Maintenance^® Clarifying Shampoo is new technology to reveal your healthiest hair. Optimize your hair repair results by removing more impurities that damage hair. Harsh clarifiers can leave hair like straw. Nº^.4C is sulfate-free & pH balanced to maintain hydrated hair.