3. Shampoo should be massaged. When shampooing, first soak your hair with water, and then use shampoo. Apply the shampoo to the hair for the first time, and rub it with the belly of your fingers like a massage. Especially the epidermis of the head is easily stained by sebum and sweat, so it should be washed carefully.
For the second time, use half of the amount of shampoo used for the first time to clean. After washing, rinse with water repeatedly until there is no shampoo on the hair.