Facial cleanser is a skin cleanser. Its purpose is to remove dirt from the skin, refresh the skin, and help to maintain the normal physiological condition of the skin.

When a cleanser cleans the skin, the object (or substrate) is human skin, and the dirt that sticks to it is basically sebum and cuticle fragments and their oxidized decomposition products (dirt), or cosmetic residues that stick to them.

These residual metabolites are unstable and can react with oxygen in the air, or with deposited molecules.

When exposed to sunlight or in the presence of bacteria on the skin, a variety of physical and biochemical reactions take place, forming substances that may harm the skin.

Thus, even for healthy skin, skin cleansing is an essential part of skin care. In addition, sensitive or fragile skin, due to its characteristics, requires special cleaning and care.

For problematic skin types, the mildness and safety of cleansing milk must be considered