remove grey on sideskirts-older E36

i heard that the gray sideskirts on the later models of E36 cars (ie; '92-96ish) can be rubbed off with some elbow grease. i followed the instructions and after 30 minutes i had no result, except a stronger right arm. the plastic that supposedly covers the original color is rock hard, does anybody know a good method of making the sideskirts the car color?

http://forums.bimmerforums.com/forum/showthread.php?t=76342 paste that into your browser and look for the gray sideskirt removal. shouldnt be hard to find

Here ya go . . .

http://www.geocities.com/e36rulz/sideskirts3.html

umm... 92-96 3'ers would be the earlier model e36's... just FYI