#4 Phenol/Phenoxyethanol [2-PE]
Used as anti-freeze. TOXIC to all cells and capable of destroying the immune system.
2-Phenoxyethanol is an organic chemical compound that is sometimes used in cosmetics and antiseptics. It is also currently used as a preservative in one FDA-approved available vaccine, Ipol, for the prevention of polio, at a concentration of 0.5%. Benzethonium chloride is a chemical that has antimicrobial properties. Source