someone mentioned windex with ammonia in it. He said its a common type of windex available at stores. He sprayed it and let it sit for a little bit white it loosens the adhesive. Once you get the tint off it's game over, you can use some goo gone or continue with the windex.

Side note - I was using goo gone on my wheels to get the off the wheel weight adhesives and it works very well. You just have to wait while the goo gone works it's magic. Very effective against adhesives...

dude must be talking about this windex -
http://www.windex.com/products/original-glass-cleaner/