---

Black mold. Gets everywhere where the surface can accumulate humidity and not have adequate ventilation e.g. the bilge.

Get yourself some Tile-X Mildew "root penetrator". Spray, let sit, wash down.

I've never seen this is the stores and usually order wherever it is cheaper, amazon or eBay.

https://www.amazon.com/Tilex-Mildew-P...penetrator