I've got an update. Not a good update, just an update.

There is hours into this rear window tint glue removal.
The tint came off in one complete sheet with the help of a heat gun.
The glue is it's own problem. I'd say 75% of the glue stayed with the tint but the %25 left on my rear window with defroster lines is work.
Using a plastic razor blade and Goo Gone I've accepted the fact progress is being made, just not much of it.
Been using the blade to get the big areas scrapped down but close to the defroster lines it's just spray and wipe and repeat 10x's. Even with the glue gone there is a oily film which needs the help of Windex.