I had completely forgotten that I was drawing and started to use my MacBook. I realized I had a tiny smudge after so I went to wipe it off with my other hand. Unforunately my other hand was covered in graphite (or whatever it is pencils have in them) and made a huge mess. I got most of it off with a damp cloth. But it's still noticeable. It looks like the discoloration issue lots of people had, only grey.
Does anybody have any idea what would best remove this?