I bumped my sons hand last night and his ipod touch skidded across my macbook airs trackpad. After I picked up the ipod I inspected the macbook and I noticed a dark smudge on the trackpad. I don't recall if it was there before or if the ipod caused it. The smudge isn't a gouge or deep though so maybe it was there before. I was going to try a magic eraser to see if it will come off but I don't want to damage it. I saw lifehacker used a magic eraser to remove oils from the trackpad and I also have oil buildup on mine so I wonder if it would be safe to try using it to remove the smudge. Anyone have any experience with the magic eraser? I don't have any pictures of the smudge but I can try posting one later. Thanks.