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Hair washing is the cosmetic act of keeping hair clean by washing it. To remove sebum from hair, some apply a surfactant, usually shampoo (sometimes soap) to their hair and lather the surfactant with water. The surfactant is rinsed out with water along with the dirt that it bonds to.
Furthermore, there are dry shampoos; powders that remove sebum from hair by soaking it up prior to being combed out. People often use dry shampoo if they would like to postpone their hair wash or simply to save time.
Hair wash and dry shampoo keep the hair healthy, add volume to the hair, remove dirt and odors, and remove oils from the scalp.