I had a microfiber cloth laying around the house and I used it to clean my Ipad's screen with, realizing only later that I had once used it (several months ago) to clean & polish my guitar with. I am afraid I may have wiped the oleophobic layer off the screen. Now whenever I use the Ipad the screen doesn't smudge as much as it used to. Most of the grease can only be seen under direct sunlight. I am wondering if this is the effect of the oleophobic layer having come off or if this is normal after the first time you clean it. Comments anyone?