An old issue with MacBooks, but I don't think I've personally had it before - one of the keys (left shift) seems to be leaving a mark on my screen. It happens when I don't clean it for a few days. I don't think this is a big deal, but paranoia works its magic, so I ordered this https://www.radtech.com/products/screensavrz-macbook-pro-keyboard-cover I like the idea of having a small cloth to wipe the screen with me, and it seems safe enough to use. They explain how they designed it to fit the small gap and all, but I've been wondering - can these somehow damage the hinge or screen or something? I may end up not using it, but wanted to see what people think of those. Thanks.