Hey! They should replace your whole screen free of charge, since it's faulty.
I discovered this issue last week on my rMBP, whilst I was cleaning the screen. My screen already had minor stains from before, but after wiping them with a slightly wet cloth, the stains got a lot worse.
I was shocked as the stains wouldn't come off, and at the time I didn't know they were permanent. I thought they were old smudges and bits of dust that simply didn't want to come off. I did some google searches and came across several articles along with this discussion page and then realised that the issue was serious.
Later in the evening, I contacted Apple Support via online chat and explained the issue as well as how it happened. They simply booked a Genie Bar reservation with my local Apple store. At the store, the technician checked out the screen and said that it will be replaced free of charge through a program. (Sorry, I don't remember the name of this program).
The technician took my rMBP in and replaced the whole screen within four days. I'm using it right now and it feels great to have it back. The service at my local store was fantastic and the staff were very kind.
*Just to mention, I did get asked:
- How long have I owned my rMBP for
- Where did I purchased my rMBP from
- How long have the stains been on the screen for.
*I pushed the points of mentioning that:
- I've been cleaning my rMBP the same way I used to clean my old MBP, which never developed any stains on its screen.
- Many users experiencing stains are having their screens replaced free of charge.