My iMac 2012 has grey marks/dirt underneath the glass?

I have had this computer for under 2 years and at the bottom corner of my screens are becoming dirty. And it's only getting worse. You can only see the marks when there's plain, light colour behind it. Has anyone else had this problem? Is there a way to get rid of it? Or will it cost a lot of money to solve the issue. The pictures don't really do it justice.
Thanks,
Matt

This is all at your own risk of course , but you could remove the front glass very carefully (the magnets are strong and when you put it back it wants to pull the screen to the chassis of the computer with some force, so be prepared).
Here's a video: https://www.youtube.com/watch?v=SDciJHx4II4 screen removal is about 48 seconds in (I'm assuming yours is an iMac that has the glass screen that is not glued into position).
P.S. I have done this a couple of times to my two Macs without any problem and I've managed to clean away the grime - just go slowly and carefully. I used my satnav base as a suction cap and found it easier moving the glass from the top edge rather than the side.

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Apple Service and Support in the Philippines.
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My iMac 2012 has grey marks/dirt underneath the glass?

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