400 yuan, a bottle of shampoo is expensive. Shampoo, also known as shampoo and shampoo, is the most widely used shampoo and one of the most commonly used hair cosmetics. [1] It is used to clean the grease, sweat scale, cells shed from the scalp, foreign body dust, microorganisms, residue of styling products and bad smell secreted by the human body attached to the scalp and hair, and keep the scalp and hair clean and beautiful.