Check out Tint Protector. They have a product they supposedly designed specifically to prevent scratches on your tint. May be better than the one tint shops use (if any) and since I don't want to open up my door panel more than necessary, I got some to have my tint shop use instead. Last thing I want is to be parked in the heat, have some other felt's adhesive melt and all over my tint.
http://www.tintprotector.com/bmw/index.htm