I spent all day Wednesday peeling off the side windows tinting as it was all crazed.

I then spent all day Thursday peeling the tint off the rear window.

Going through Google I checked out how to get tint off as easily as possible.
Using heat seemed the best way so I tried a hair drier, steam cleaning machine (small one) Metho, window cleaner which clearly states "dont use on tinted windows" and soaking each window in water or metho or cleaner.
The tinting ended up coming off in 2 parts, being the coloured part, and leaving a 2nd layer with the glue. Everything was definately hot enough it just would not budge.

The only way this stuff moved was a soaking pad head fitting to the steam cleaner and a heap of sharp safety razors to scrap it off.
The rear window was the worst due to the demister and I am not sure what state it is in at the moment. All looks good but you never know.
All I do know is I tried all the recommended options except using amonia but drew the line on soaking the windows with this one. Pretty dangerous.
My thought on window tinting is now "if you think one day you may be pulling window tinting back off that you are about to install, think carefully" either that or get a professional to take it all off but make sure they know what they are doing.
Just glad I decided not to put tinting onto the MY wagon.