Hey, I have a ground floor flat, there is a corridor separating bedroom, living room, storage room and bathroom. I noticed that there are small spots like oil on drywall in a corridor and in storage room, it’s barely visible with naked eye. I think ventilation is poor there. Could it be a mold or mildew? I checked it under 365nm UV light, and these spots are kinda bright orange color.
What would be the best option to detect what kind of mold/mildew is that?
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