Soap!

Soap is a surfactant used together with water for cleansing and washing. It is manufactured in solid bars and in the form of a thick liquid, bottled in soap dispensers. Soap is normally composed of sodium and/or potassium salts of fatty acids derived from a process known as saponification, which isreacting fat with lye The fats are hydrolyzed by the base, producing glycerol and crude soap.

This site is all about types of soap, soap making and soap products.