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enter image description here

Mold or dirt? Leak for 6 months saturating this area.

  • Does it have spores? Spores would give a sort of dust. // I'm not sure, but I think I see some efflorescence on the metal along the sides. // If you want to play it safe, you could spray a 50% vinegar solution on the whole area to kill any mold that might be there, before starting your cleaning. Also, do you have a hygrometer to measure the humidity? Mold is more likely to grow well in higher humidity. – aparente001 Feb 7 at 1:30
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From what I can tell from the photo, it looks more like rust than mould. I'd wash off the loose dirt first to be sure though.

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    I agree it looks more like dirt. – Ed Beal Feb 6 at 14:19

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