My car, 1980 SC Targa, was rust proofed when new by the original owner. There's a bunch of black plugs where they drilled holes and squirted that stuff into hidden areas. Other areas have gobs of it too. I'd like to remove it where it's visible particularly in the engine compartment. Mineral spirits doesn't do anything to it. Acetone works okay but I've read that acetone can damage paint. Here's a bit I tried cleaning yesterday with acetone and then wiped down with water. Any other suggestions?
