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curious - I'm in the process of wiping down and cleaning a recently purchased 2004 hull and am wondering where all the black muck and grunge accumulated from.

Boat was not submerged, but every surface as seen from each access hole and interior hull surface is covered with an easily removed muck. a little clorex spray, toothbrush scrub and it wipes right off, but almost has a dead mold appearance. curious if anyone else suffers same.

robb - 2004 conquest 305