The trouble with some solvents and cleaners is what to do with it when it needs to be replaced. Flushing it down the drain is usually a no-no and the auto parts stores don't want it mixed into their recycled oil. I use diesel or kerosene as they can be added to the used engine oil without a problem (so far anyway!) The down side is it doesn't dry to a paintable surface.....you have to remove the residue to get it clean enough to prime. That and the smell....ugh.