The compound that lower the surface tension between two phases, like between two liquids, a gas and a liquid, or a liquid and a solid are called surface-active agent or surfactant.
The definition of detergent/s are product/s intended for use of washing and cleaning process in domestic or industrial areas (examples as in washing machines; dish washers etc).
Polyethylene glycol or abbreviated as PEG is a polyether chemical compound. It is formed by the addition of ethylene oxide to ethylene glycol or diethylene glycol. The common structure of PEG can be expressed as H−(O−CH2−CH2)n−OH. PEG is a hydrophilic molecule, having low toxicity, flexibility.