I took the lawyer sticker off my 1800's gas tank and easily removed the residual
goo with boiled linseed oil. Oily stuff is great at attacking some kinds of
goo, but not all. Naptha nukes some kinds of goo but doesn't phase
some kinds of delicate lacquers... Alcohol works on some kinds of goo...
I feel lucky when I reach for the right kind of solvent the first time

...
-Mike