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A cleaning composition for paint delivery systems includes 3-90% of an organic solvent which may comprise one or more aromatic hydrocarbons, aliphatic hydrocarbons and aliphatic esters. The composition also includes between 0.5 and 30% of a hydroxy carboxylic acid such as glycolic acid, as well as a

A cleaning composition for paint delivery systems includes 3-90% of an organic solvent which may comprise one or more aromatic hydrocarbons, aliphatic hydrocarbons and aliphatic esters. The composition also includes between 0.5 and 30% of a hydroxy carboxylic acid such as glycolic acid, as well as a coupling agent which may comprise one or more alcohols, glycols or glycol ethers.

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[ I claim:] [1.] A paint line cleaner consisting essentially of, by weight:20-90% of an organic solvent selected from the group consisting of: aromatic hydrocarbons, aliphatic hydrocarbons, aliphatic esters, and combinations thereof;5-30% of a coupler selected from the group consisting of: alcohols,

[ I claim:] [1.] A paint line cleaner consisting essentially of, by weight:20-90% of an organic solvent selected from the group consisting of: aromatic hydrocarbons, aliphatic hydrocarbons, aliphatic esters, and combinations thereof;5-30% of a coupler selected from the group consisting of: alcohols, glycols, glycol ethers, and combinations thereof;0.5-30% of a hydroxy carboxylic acid; andoptionally, water in an amount equal to up to 30% by weight of the amount of said hydroxy carboxylic acid which is present.