If the screen of your MacBook Pro Retina starts to get stains that you can’t remove. Well you are not alone. Seems Apple has a problem with the coating of the screens and for some of us, the coating comes of. Where the coating is removed the screen looks like it is covered with grease. Cleaning those areas will not work, it does have the ability to make it worse though.
Apple up until today has not confirmed this issue. If you have problems I really recommend you return your Mac as long as it still has guarantee (AppleCare).
More info can be found here.