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Strange stain on screen


 Few days ago I noticed a small stain, 5 millimeters in width and 1 millimeter width on the screen

At first I thought it was a scratch, but I noticed that if I clean the stain with a microfiber cloth, it completely disappears.

But when I touch with finger where it was or wets the area, The stain returns!

It looks like this place rejects fat and water.


why is it happening? Is there a way to clear this stain?