Battery terminal post cleaner

A method of treating a corroded terminal post of an electrical storage battery wherein a coating layer of corrosion products and oily residues adheres to said post, which comprises, spraying onto said coating layer of said terminal post an aerosol of a mixture consisting essentially of a liquefied halogenated hydrocarbon propellant and non-volatile mineral oil, said aerosol being sprayed from an aerosol pressure package under an internal pressure of a vapor phase of said propellant, said aerosol spray being deposited as a coating film on said coating layer and said propellant foams and evaporates while in contact with said layer and thereby removes the oily residues from said coating layer and transforms said corrosion products to a powder whereby said post becomes clean and said mineral oil remains as a corrosion-resistant coating on said post.