I use electrical tape to 'peel' the AS film off. The gooey adhesive even gets down into the pores of the ceramic thunderbirds and lifts the silver particles right out of there. It'll take a little bit of tape but it works better than anything I've seen before.
How come nobody has said eraser yet? To clean AS off of the ceramic part of the cpu, use a regular old eraser off of a pencil. It does wonders, really. I utterly destroyed my cpu with AS2 when I first got it. acetone on the core and an eraser on the rest cleaned it up perfectly.