I got an InvisibleShield screen protector for this thing, but currently it's full of fingerprints and smudges, and I figured I should clean them off before I put on the protector. What is the best way to clean this?
A microfiber cloth is usually the best way to do it. As long as it's nothing rough that could scratch the glass, you're good. Flannel, as long as it's clean and not too worn out, will work. And even an old car-washing trick: newspaper (just don't use anything with too much ink on it).