Typically 70-80% of shampoo is water. Primary detergents are ammonium lauryl sulfate, sodium lauryl sulfate, and sodium lauryl ether sulfate. Propylene Glycol (PG, Polyethylene Glycol (PEG), and Ethylene Glycol (EG) are petroleum derivatives that act as solvents, surfactants, and wetting agents. Typical foaming chemicals include lauramide DEA or cocamide DEA.