Cheap does not necessarily mean that it is not easy to use. The quality of goods made in Pinduoduo is acceptable (personal opinion). Bath gel depends on the ingredients.

Adult skin is usually weakly acidic, and the pH value of normal epidermis is between 5.5 and 6.5. Overacidic or overbased skin will destroy the protective effect of skin, and the increase of pH will reduce the barrier function. Therefore, the pH value of shower gel used to clean the whole body should be close to human skin.