so I sat down once again today intending to finish chiseling out the sound deadener from my crx. And as usual, after half an hour I lost interest.
So I decided to try a new approach... I put a wire wheel on an angle grinder, and used it to brush off the sound deadener. As promised, it was quick, and dirty. Little black bits were flung all over. They cleaned up very easily with a shopvac though

Just thought I'd share this method for anyone else who's frustrated with chiseling