Water, blow dryer, etc...... don't work!

What REALLY works is get a $2 bottle of ammonia. Spray & peel the film off slowly and once it's all off then spray the glass and scrap the glue off with a blade. Do it in an open area cause the smell is pretty strong. Wipe down with a window cleaner and you're all done.

That's what I did on my driver/passenger windows on my accord and worked great.