An ultrasonically agitated solution which includes a special solvent consisting essentially of (a) about 0.1 to 3.0 parts by weight of water, (b) about 3 to 7 parts by weight of an alkali metal hydroxide and (c) about 96.9 to 90 parts by weight of an organic solvent selected from the group consisting of lower monohydric alkanols of 2 to 4 carbon atoms, ethylene glycol mono alkyl ethers, wherein the alkyl group contains up to 4 carbons atoms, and mixtures thereof, and methylene chloride and, possibly, acetic acid is used to strip a silicone oil base grease from electronic module caps. The caps are placed in a container of the solution and agitated. They are then removed, water rinsed, and blown dry.