It could be glue from the clear plastic cover it ships in.
I suppose you could take it in, and they will exchange it. However you could also try a few things first, but any of it might void your warranty.
1. WD40, spray some on a towel, and rub it on your screen, to see if it helps remove anything thats there. Do a test spot.
2. Goof Off, same thing. (stuff has an orange smell)
3. Last, acetone.
I have glasses, with anti-scratch/anti-reflective coatings. I had something on them that I couldn't get off. I thought they were scratched. I took them in to my optometrist. They used there "all-off" liquid and it cleaned them right up. I asked them what it was... Acetone. They said it's very bad for glasses with plastic frames, but since I had stainless, it wasn't a problem.
Anyway. Those are things you might try to clean the glass. I don't know if it would void the warranty. Or you could take it to the eye glasses place in the mall, and ask them to try cleaning it, like a pair of eye glasses, with whatever strongest stuff they have.