Abstract: An acetal-based composition is described which includes an acetal of formula R—O—CH2—O—R?. R and R? are mutually independent alkyl or alkoxyalkyl substituents with at least three carbon atoms. The composition is useful as a thinner and/or a detergent and/or a stripper. The composition may be used to clean surfaces which are metal, glass or wood and is particularly well adapted for use in the automotive industry. The thinning/cleaning/stripping composition may be stored in a polyethylene container.