Stains transfer from Alienware laptop bag to lid cover (external surface)

Hi,

Not sure if other owners have encountered this issue. I just got the laptop in September and when I pull it out from the bag recently to use it, I saw the cover is smudged with stains that comes from the inside of the bag.

See images:

Can some one tell me is there a way to remove these stains on the lid?

Thanks,

Victor