I would DEFINATLY NOT soak it in acetone. Acetone is so highly flammable, plus will eat through alot of different plastics. I work with acetone everyday and it is not a common cleaning liquid!!!!!!!
I agree...bad idea. Acetone is a very aggessive solvent, and it can attack certain plastics. I'm of the personal belief that hot soapy water, followed by a light application of a pl;astic safe preservative (CLP) is the answer to cleaning without disassembly.
Mike