Hey MR! I've had the new iPad 2 since day one with the smart cover attached pretty much 24/7. I have, as the thread title says, the gray polyurethane cover. I always flip the smart cover over when I'm using it. As a result, it's starting to get a little dirty on the inside, with dirt & other stuff that makes the inside dirty starting to show up inside the cover. Am I alone, or does this happen to others? More importantly, does anyone know of any liquid or technique that can help clean the inside microfiber part if the cover? Thanks for any help!