The best way is to "sweat" it off.
Take some black trash bags and cut them to fit each window that you would like to remove. Next, spray the window with Windex getting quite wet with the solution. Next while the glass is wet, apply the black plastice over the glass. Make sure there is enough windex between the bag and the glass. Move vehicle into the sunlight for 1 to 2 hours. At that point, you should be able to remove the tint and adhesive in the same motion, by grabbing the top corner and pulling it off the glass. If it doesn't come easily, it hasn't sweated enough.