Shampoo is a hair care product, typically in the form of a viscous liquid, that is used for cleaning hair. Published April 18, 2016 at 500 × 375 in Shampoo is a hair care product, typically in the form of a viscous liquid, that is used for cleaning hair. ← Previous Strong Hair Formula Prevent Hair Loss Shampoo is a hair care product, typically in the form of a viscous liquid, that is used for cleaning hair.