Sony A6000 marks on viewfinder

[Arkan]

Hi, my sony A6000 have these weird marks on the viewfinder. I tried cleaning it but it’s not coming off whatsoever, anyone knows what it is? The marks dont appear on the digital viewfinder when i see through it though

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Edited September 27, 2021 by Arkan
Adding details

[tadwil]

It looks to me as if yourself or the previous owner(s) tried cleaning the viewfinder using a wet lens wipe and the solution seeped in behind the glass.  This sort of cosmetic damage looks bad because of it's visibility but has no effect on the use of the camera as you have pointed out, just live with it.