There's this stuff called "Orange Solvent" that is made specifically for this. It works great. I don't know exectly what company manufactures it, but if you go to stores like Save-On, Home Depot, or any place they would sell cleaners, you should find it. All you have to do is put it on a paper towel, wipe the sticky part, and it comes right off. Then clean the solvent residue with water, then windex. Hello shiny clear window.