IMac Screen Looks Cloudy

Hi
My iMac screen has become hazy in the middle of the viewing area.  It is not the pixels, but looks more like it is on the outside.
I tried cleaning the exterior, but that doesn't help.
I don't think it is condensation inside the screen, but it looks a lot like it.
Any ideas?

Hello, sounds loke the common dust problem...
https://discussions.apple.com/search.jspa?resultTypes=&dateRange=all&peopleEnabl ed=true&q=smudges&containerType=&container=&containerName=&username=BDAqua&rankB y=date&numResults=15

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