Outer Limits 4x4 Board

Have taken the tint off all but the back windows.
Has anybody done this before?
Would like some advise as to how to get it off without damaging the rear dimister tape thing.
Figure i just go slow and keep the scrapper off it but any more help would be great
Cheers

Darryl

I have seen it done with an old kettle constantly on the boil - the steam makes it all soft and you just peel it off....