What is meant by static cling films? Im planning on getting the 3m screen protectors for my iphone 4s. On the product detail in it's website, it states that it doesn't leave any residue. Therefore, is this film adhesive considered as "static cling"? So, can it be said that static films are the screen protectors that doesn't require any liquid to stick unlike the adhesive films that does require liquids to stick like the zagg invisible shields? Correct me if im wrong Thx in adv.