If you did have some oil stains, I found that using the extra powerful Mr Clean Magic Eraser helps and cleans it up, I would use this on PLASTIC ONLY, because it is slightly abrasive and will ruin your display or scratch your aluminum, it is fine on the Unibody MacBook bottoms and keyboard or the top case of non-Unibody MacBooks (keyboard, palm rest, and trackpad) but I think that it will leave scratches on the shiny hard plastic.
Hope this helps,
Macfan