Oh, no. You didn't pull the film and leave the glue did you? If you left the glue behind, you're going to have to take your time and windex it...a lot. Or, if you have a steamer, that might be easier. If you haven't pulled the film off, I have an excellent method. I pulled tint off a car a few weeks and found an excellent method.
Spray the glass down well with Simple Green, and cover it with cling wrap. This prevents the Simple Green from drying or running off. Let it sit, preferably in the sun and heat, for a little while. 30 minutes worked well for me. Then let the defrost run on it for at least 5 minutes at full heat and power. This is especially useful on the rear! Now use a razor to pick a small portion of the tint, just enough to get your fingers on. Now you can pull slowly and carefully, and the adhesive will come off with the tint. Only a little residue will be left anywhere on the glass, and a few good cleanings with Windex will have the glass completely clean.
I have heard of a lot of different substances being used to remove the adhesive that is left after the film is removed. I used the following and found that Windex still works the best: windex, amonia, simple green, WD-40, dish detergent and water. They all did a good job, but the Windex did better, and is not as harsh as the amonia.