Go. Cotton oil soap has a high alkali content, oil and dirt removal ability, the skin is less irritation, people will use cotton oil soap to wash their heads, shave their faces, shave their beards. So cotton oil soap wash your head to remove dandruff. Cotton oil soap is crude cottonseed oil plus caustic soda boiled brown soap-like, can become emulsion in water, alkaline reaction. Cotton oil soap stored for too long, the color will gradually fade, and even become white.