get u some warm soapy water and some rasors
if the tint is bad, use simply green and put a garbage bag up to the window and let sit in the sun. this works on the back window along with some steel wool
use straight razors for the front, try to pull from the top corner down. this as always worked, there was only 1 car I have ever did where I had the tint come off in little pieces and I had to simply green the back window. I still have nite mares