We have a mulch job coming up, the guy said last time he got it from XXXXX it made black specs all over his white siding. I guess it was some sort of fungus in the mulch? Never heard of such a thing myself, anyone here? I saw the black specs, they don't come off whatever it is, or if it's even from the mulch, who knows. Getting the mulch from somewhere else would be a pita, theres no one else in town that has that much mulch. Anyone hear of this?