Hi,
I have an miniature meths-fueled model steam engine that probably hasn't been run for 50 years.
The wheels won't turn as as the pistons are jammed solid, probably with gunk, solidified oil, or possibly rust.
I would like to give it a good soak to gently dissolve or soften the oil residues, but I can't risk anything damaging the original paintwork, as that would ruin it.
What solvents are suitable to do this?
I'm assuming that white-spirits and acetone will attack the paintwork, but what about isopropyl-alcohol, ethanol, or panel wipe (aka naptha?)
(Suggestions for a better technique are of course welcome.)
Thank you