New, never been used 10 fl. oz - full size This clarifying shampoo deeply cleanses away dirt, oil, and product buildup with detoxifying apple cider vinegar and hair-strengthening keratin. HOW TO USE: Thoroughly wet hair from roots to ends, then squeeze out excess water. Lather a quarter-size amount in hands, then part hair using fingers and apply as close to the scalp as possible. Let sit for 1 to 3 minutes, then rinse!