1. Human skin has a layer of natural oil. After washing with soap and shower gel, this layer of oil will be washed off. Because a large number of ingredients in the shower gel will remain on the skin surface, forming a film that will make you feel moist. A lot of shower gel is slippery after washing, and it feels like it will never be clean. On the contrary, soap does not form residue on the skin, so when the oil is washed away, you will feel dry and itchy.

2. Most soaps are alkaline, which is more irritating to the skin than shower gel, except soap-based shower gel.