Removing old tint

Does anyone know a way to get old tint off of your windows. I tried to peel it but it comes off in layers and I can't get the clear adhesive layer off. Any suggestions? I need it done by next week because I'm getting married and I don't want to ride around on our honeymoon with messed up tint. I don't have ANY time to get to a tint shop.

i used a plastic razor blade and some adhesive remover from walmart with a cloth