Polyoxyethylene Nonylphenol Ether, also known as nonoxynols, is a common ingredient found in many household products. The general formula for nonoxynols is C9H19C6H4(OCH2CH2)nOH, where the number (n) of ethylene oxide repeated in the chain characterizes each nonoxynol. Nonoxynols can be found in various products such as detergents, liquid soaps, emulsifiers for creams, fabric softeners, photography paper additives, hair dyes, lubricating oils, spermicides, and anti-infective agents.