I work at a printers and we use isopropyl alcohol and methyl ethyl ketone (don't try and get or use this) at different ends of other things..
I worked as an Ink Mixer during the fuel crisis in the early seventies and we used to add MEK and Ethyl Alcohol to the tanks of our cars and bikes to supplement the scarce petrol. You could get away 2/1 petrol/solvent mix in the much cruder engines of the day, which would probably be more than enough to knacker a modern engine.
A mate of mine was a paint sprayer, he used 'thinners'.