heat gun helps a bit.
If its on the roll downs. Take them out and put paint and decal remover on them. Much easier then scraping. Also, say good bye to your rear defrost(if it has it). When you peal the tint off, it pulls off part of the strips.
I had tint on my GP took it off cause it wasn't dark enought took me 25min for all 5 windows. My 240 had old bubbled purple tint. Took a whole weekend.