Dry cleaning is the easiest way to damage hair. Because of the strong water absorption of dry hair, direct use of shampoo will make its surfactant penetrate into the hair, and this surfactant can not be removed only after one or two simple rinses. They remain in the hair, which will destroy the hair keratin and make the hair lose its luster. On the contrary, wet washing does not have this problem.

Chemical shampoos are mostly used for dry cleaning hair. When shampooing, the action of massaging the scalp is easy to open the scalp capillaries and absorb the chemicals in the shampoo. Long-term accumulation is easy to cause cerebral infarction. Therefore, when washing your hair, you'd better get your hair wet and use the shower nozzle to let the water run down your hair. It is best not to soak your hair completely in the washbasin.