i decided to pull it off, but i think my iPhone is not as smooth as first i bought it. it's like there is residues on the screen but i can't see a thing, the screen is so clear but i believe this sticky thing is caused by the screen protector. i have tried cleaning it using damp clothes, alcohol, and water, but it's still having the sticky feeling. it's hard to play games that use analog d-pad like Pro Evolution Soccer. any idea how to make it perfectly smooth again like brand new?