You used to be able to buy Methyl Ethyl Ketone in any paint or hardware store. I think you still can in many parts of many countries. That stuff should probably not be in the hands of us plebes. It’s pretty awful.
Back on the farm my dad would wash his hands in gasoline after working on the machinery. Safe, no, but a hell of a solvent. No grease or oil can withstand it. Luckily we have Fast Orange and Gojo these days (not to mention nitrile gloves). 
