If yo hadn't pulled the tint off yet a heat gun works great. You can still use a heat gun on the back window to soften the glue that is still on there and hit the open areas with the blade and what ever is left with a rag. Then once all the areas a cooled down, get some dish soap and a clean rag to clean up the rest. Dawn dish soap seems to work pretty good for me. Still will take a little time to get it all cleaned off, but should be a little easier.