Skin cleansing is the base of all care. Face and body are cleaned from sweat, sebum and dirt, thus cleaning must be thorough but also mild and gentle. Especially in case of skin problems like neurodermatitis, psoriasis and acne, daily cleaning is very important for the therapy. Cleaning products must be adapted to the skin's problems avoiding that they become even more severe. Pure water is not sufficient to clean the skin properly - wash active substances are needed. However, if cleansing products are too aggressive, they destroy the protective acid mantle which protects the skin by its acid pH value.