Just curious, have either of you tried any of the industrial citrus based solvents for your parts cleaner(s). The guys over in the tool room have switched over to it. It's cheaper, friendlier to the environment (so I'm told) and supposedly works just as well as some of the other solvents.I have mine filled with Varsol which you can get at your local parts store.
good point, Ive got mine filled with a mix of degreaser , carb cleaner and water, it deffinately will peel off a good deal of crud over about 15 minutes
a sand blast cabinet comes in handy for the heavily layered/rusty crud