it helps if you got a pair of angled vice grips to hold that razor blade.... believe me your hand is goign to cramp lol... i remember scraping a bathtub completely covered in soap scum (cleaners even stool wool wasn't doing it) after i was done, i couldn't move my hand from a clamping position...

you are of course take the door panel off to put this window in right? what window and where? cuz i've never heard of bolting in windows...