New 27" iMac Screen Has Grey Marks

Called Apple support. They just told me to take into an Apple store. I've had my new iMac for maybe two weeks now and I just started to notice the lower half of my iMac screen has a sort of grey / purple residue throughout. Not sure if it's on the outside or the inside but it appears to be on the out. I've tried wiping the screen several times with the black cloth that came with my computer but nothing gets rid of it. I've also tried a very damp cloth.
Any ideas?

I have a late 2009 21.5 iMac.
Last night my friend brought his mid 21.5  2010 iMac here so I could upgrade him to Yosemite ( I have very fast internet).
Anyway, side by side, the 2010 iMac is EXTREMELY bright compared to my late 2009 iMac.
Here is a photo that I took of them to give an idea. I posted a question about it elsewhere here but no responses yet.
You can see the color profiles for each. The 2010 is on the left, 2009 on the right. I wonder if there's a way to adjust the color profile to match the 2010?
If you look ...you can see mine has a grey tinge ....(it looks yellow on my monitor but on the camera and to my eyes, mine is definitely a grey tinge. The 2010 is bright white no matter where you look at it.
Below is a link to my original post in detail for anyone who might have a solution:
https://discussions.apple.com/thread/6629552

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