Grey 'smudge' the middle of the screen??

OS X Yosemite
iMac (21.5-inch, Mid 2011)
Processor 2.5 GHz Intel Core i5
Memory 4GB 1333 MHz DDR3
Startup Disk Macintosh HD
Graphics AMD Radeon HD 6750M 512 MB
Not sure exactly when it started but I noticed it about half an hour ago and have come straight online to 'troubleshoot' the problem. The is a grey smudge/shadow in the middle of my screen and I am unable to remove it by cleaning the screen or restarting my computer. I have seen similar issues posted with no resolve so I don't know if people discovered a fix or just gave in and took the computer into the Apple store. With no way to transport the computer safely into the city centre, I would like to avoid doing that if at all possible.
Any help would be greatly appreciated.
Rebecca

This is a well documented issue:
https://www.google.com/search?num=20&safe=off&client=firefox-a&rls=org.mozilla:e n-US:official&channel=sb&biw=1859&bih=955&q=imac+2011+screen+smudge&oq=imac+2011 +screen+smudge&gs_l=serp.3...16500.17383.0.18707.6.6.0.0.0.0.91.389.6.6.0....0.. .1c.1.58.serp..2.4.246.hDwVn2rPeQE&tbas=0
Unfortunately I also share the same issue with you, only 2 years earlier, and basically all iMac of that model are bound to have that problem eventually.
In short, somehow dust is able to get into and accumulate INSIDE the LED component, specifically between the glass and the first layer of the LED display unit. Note that this is NOT between the LED and the protective glass which you can touch, it's IN the LED itself and you will have to dissemble the display unit to have any chance to fixing it, which is a high-risk surgery unless you are a techie.
Many of us, myself included, just decided to live with it instead of taking the risk, though it's your call at the end of the day.
Here is a youtube video FYI so you can see exactly what you will have to do to fix it yourself, good luck.
https://www.youtube.com/watch?v=1rGBpCIQKlg

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Grey 'smudge' the middle of the screen??

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