I did exactly as described above with scraping the clear coat with a razor blade, then polished using TR-3. it came out great. I did that to the entire hood, roof, and trunk of my E21, came out amazing!
I re-polish it about once a year with the TR-3. It took me about a year to finally get it all, it is a slow, painstaking process with the scraping and buffing a little at a time, but if you aren't going to paint anytime soon, its not a bad option.