Glycerol

Glycerol (also called glycerin) is a clear, viscous, non-toxic polyol widely used in detailing chemicals as a lubricity and humectant agent — it adds slip to wash solutions and helps surfactants encapsulate dirt. It is one of the safer ingredients in the category, with FDA GRAS status and no GHS classification at typical use concentrations. Glycerol is fully biodegradable, non-bioaccumulative, and does not contribute to aquatic toxicity. It is on the EPA Safer Choice safer chemical ingredients list. Use in waterless and rinseless wash products at 0.1–1% has no health or environmental concern.