1 Pressed a bug on the screen, got a permanent stain
See the centre, at the right side of the line of "(LCD) for..."
A few minutes ago, I found a really small bug (like a book worm) was crawling on my screen. I grabbed a piece of paper tissue, and pressed hard on the bug to kill it. I think I used at the tip of my nail on the tissue.
I could not find the dead bug, but now I have a permanent strain on the screen. It is not something on the surface because I wiped it really hard and it did not go away. The glass surface does not seem damaged when I examined with a flashlight.
I did not expect pressing an LCD screen with fingernail on a paper tissue could make a permanent strain. Is there any way to remove it?
1 
Now I think the bug was actually *beneath* the glass, and was squashed. The strain could probably be the dead squashed bug.
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