hair washing

Hair washing is the cosmetic act of keeping hair clean by washing it. To remove sebum from hair, people apply a surfactant, usually shampoo (sometimes soap) to wet hair and lather. The surfactant and the dirt that has bonded to it are then rinsed out with water.
There are also dry shampoos: powders that help remove sebum from hair by absorbing it prior to being combed out. People may use dry shampoo to postpone their hair wash or to save time.
Hair washing and dry shampoo are both used with the intention of keeping the hair healthy, adding volume to the hair, removing dirt and odors, and removing oils from the scalp.

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