I just got done replacing the rusted out, steel reservoir in our System One industrial washer, it took me all day Friday. (I wonder if I have a picture.)
(It's gets no respect, I tell ya.) Today I finished reinstalling all the plumbing and putting the solvent back in. We pay something like $50.oo a gallon for that solvent and it gets regular service from our vendor. So when it started leaking out all over the floor, we had the business owner start calling around. He found a replacement tank made from $tainless steel. Real nicely tig welded tank, the old tank was mild steel, and condensation slowly ate through it everywhere, leaving rusty pinholes.
Those rusty colored spots on the left of the motor are all pinholes. I have no idea what formula of solvent they use though. It functions well for cleaning parts, and dries by the end of the day if left alone. Brake parts cleaner is way different! Fast drying, harsh, no lubricity.
I would try mineral spirits, which can no longer be bought in this messed up state.