I have done some work on the rear windows to get them to work a little better when its wet or cold out. The good news is that they work like new but the bad is that I now am getting some moisture coming through the vapor barrier where I cut through them. I sealed them with water proof tape but it looks like I need to redo them. I am getting ready to work on the right front window motor and was wondering if someone knows a good way to peel the vapor barrier back without damaging it? Any help would be appreciated.