What's this black stain in the paint?

Joined
Apr 27, 2010
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Suburban Washington DC
See it quite a few places where 2 panels meet or around some trim. Rubbing compound doesn't do much as it seems to be in the paint. Is it mold? How to remove?

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A small dab of bleach with a q-tip would make mold disapear. I wonder if it could even be shotgun fungus from a nearby hardwood mulch. Never seen anything quite like it.
 
I find that rubbing compound goes into super mode if you rub hard and fast long enough for it to start to heat up the paint. Seriously. Probably stain from years of goo sitting on top of the molding?

If rubbing compound didn't work I'd try some Goof Off. If that didn't work I'd try a fiberglass sanding pen.
 
Don't have any bleach but do have some mildew remover.
If those spots are raised above the paint, it's not mildew or mold but likely shotgun fungus from mulch. If it's shotgun fungus, you won't get it off.
 
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