The dirt on dirty hair is the grease secreted by the scalp, which adheres to falling dander, dirt in sweat and dust and bacteria falling in the air. The main component of flour is starch, which contains no alkali and surfactant and has no degreasing effect.

Starch is a polymer of glucose and a nutrient for microorganisms. Starch expands, gelatinizes and splits at high temperature, forming a uniform paste-like solution with viscosity. Dirt, bacteria and microorganisms that are used to wash hair and attach to hair and scalp and wrap hair will become a culture medium for bacteria in the future, and microorganisms will breed, making hair sticky and smelly.

After the hair is dry, the cream will tie it up, which will bring difficulties to hair thinning, makeup, hairstyle and shampoo next time.