I've taken the one off my ipod to repalce it. It leaves absolutely no residue. I have no idea how it works, because when you apply it the one side that touches the screen is a little sticky, as if it were adhesive, but when you pull it off, nothing is left there. I don't know if it has to do with the water you spray on it before you apply it or what, but there is some kind of adhesive on the film. I don't know how it works, but it does!