Stain viewfinder canon R6 MK II

[SPedro31]

Hello everyone, I found this stain on the outside of my viewfinder, canon r6 mark II. Does anyone know what it could be and how I can resolve it? Thanks.

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[mackj2]

Out of curiosity, how did you resolve the issue?

[Roko21]

How did you fix it Im having the same issue on my r5