Mac book Air Track Pad has smudge

Does smudge removable from a Mac book Air track pad? After bumping my sons hand last night, his iPod touch skidded across my Mac book’s air track pad. I examined the Mac book and I detected a dark smudge on the track pad. I am not sure if it was there before or if the iPod caused it. The smudge isn't a gouge or deep though. I saw life intruder used a magic eraser to eliminate oils from the track pad. I also have oil upsurge on mine so I am wondering if it would be safe to try using it to eliminate the smudge. I don’t want to spoil it. Who has had an incident with the magic eraser? I will try uploading photos of the smudge later. Thanks.
