Okay, my solution for the last couple of days has been to stick a Christmas card into the pocket with the back facing the screen (or turned inside-out with the inside front facing the screen). This works really well because it stays in place and I don't have to look for it when closing the book. The card is smooth and leaves no marks on the screen, whereas a plastic foam sheet might pick up grit. I clean the screen about once a day with a little Windex.
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