Two questions on doing this repair.

1. After removing the door panel I noticed that someone (either stereo installer or window tint installer) just slashed and removed the vapor barrier. Other than my window not working forever I have not noticed anything wrong with the door. Should I attempt to replace the barrier, and if so with what?

2. I have removed the window but I have no idea on how to remove the plastic clips that are glued onto the window. What is the best way to remove these clips?

thanks for any assistance - Mike