I did clean some PC screens, not all successfully...
There are two big issues with foreign objects between the actual panel and the front foild over the display.
a) they are designed to be a sealed unit
b) apart from minor dust around the edges bigger particles or even insects can only enter during manufactoring
Downside is they don't always stay sealed
Most panels use a metal frame that is clipped together or onto other parts of the panel, removing this first bit can be tricky as you don't won't to bend the clips.
Once the frame is gone you should be able to get the actual panel out (laying with the front on a table) and the display flois should stay inside the outer frame.
Some models place the various foils on the screen and the top layer is glued around the edges - this is only "cleanable" if the part of the panel is covered once mounted as otherwise you will see that you peeled the foil off the display.
But even if you really get to the stage of cleaning the panel and all foild you have the major problem of new dust settling on it while you work with the parts.
A hair, some fine dust or even your own skin flakes can get trapped again and you will only see it once you fire up the screen again.
I had a big, sealed plastic container with a glass lid and filtered air supply almost like a sand blasting chamber and even with that I sometimes had to start over as still some particles remained.
If it really is something between the foils that was alive at one stage you might also face the problem of cleaning some excrement or dried body fluids off the foil or panel, if the area is coated you can damage the coating and you will always see the spot....
Might be worth to check Ebay and Gumtree for the same model with other faults to get a cheap spare....
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