There is a large whitish stain on my imac 21,5 screen. How can I solve this problem?

My imac came up with this stain on its screen. It seems to be condensation behind the glass screen, but I'm not sure. If I rub it A LOT with a cotton cloth, it tends to disappear, but it comes back. I haven`t used any cleaning product ever, so I feel it`s a problem of the imac itself. Please, how can I solve this? I've had this machine for almost 2 years now, so it is not in the warrant period anymore, I guess.

Is the stain maybe on the back of the glass? It's an easy job to take the glass off to give it a thorough clean. Just to emphasise that as the screen is held on by magnets there is a very strong pull when you are putting the screen back on and if you are not prepared for it it could take you by surprise and snap back rather too quickly. I put the tip of my finger behind to stop it slamming shut. Repositioning of the glass is easy as there are guide pins.
All at your own risk, of course, and best to turn off and unplug the Mac whilst you do this.
http://www.youtube.com/watch?v=ONCdGHe0Uxs
P.S. I use the suction cap from my SatNav to pull the screen off.

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