Using a tint remover, you can easily remove tints from glass without scratching it. What you need to do is to steam the window so that the glue comes out of the glass and remains on the tint.
As you continue steaming, pull out the tint carefully as the glue comes out with it. The good thing is that when you use this method you don’t need to use a razor to cut the tint off the glass. This method is also safe on your rear windows since you don’t need to worry about cutting the defroster and antenna cables in the process of removing the tint.