They use Methanol as a clean up solvent, so you could probably pour some on, soak some rags (a couple layers thick) with methanol, place them on the area, then cover with plastic, tape the edges down, so the solvent cant evaporate and let it sit for several hours, that should soften it up a little for your razor blade scraping party. Be careful, methanol is very flammable and somewhat toxic...you definitely dont want to ingest it...once you do start working with it (after its soaked)... have some good ventilation around.
Dont think I would try the brake fluid. Aircraft stripper would probably work well, as well. Just be really careful with aircraft stripper.
The methanol wont hurt your paint finish, which is why I mentioned it...not in normal contact anyway...in a soak, I cant priomise anything...but like I said, Line-X uses methanol as their cleanup solvent to get overspray and mistakes up off the painted surfaces.
Again, good luck...and be smart when handling solvents and such. Wear nitrile gloves (double glove, they are cheap).
