I asked Ryan at Eastwood and he said while it will be difficult to remove it can be done.
Scrap it the best you can.
Use a solvent on what remains and scrap again. Wear a respirator.
Eastwoods SCT with the wire brush wheel should also do a fine job at removing what's left after the initial scraping. This would probably be the quickest method but the tool is not cheap. Again wear a respirator.
After scraping it the best you can a propane torch could be used. This may be easier than the other methods but you better be extremely careful. I will not recommend this method because I do not want to be liable in case you burn up your car, burn down the garage , harm yourself or even worse.
Charlie