ron p
if you are talking about a black dot about the size of a pin head, seems to be where mulch is near the house, no the bleach wont help.
It's called shotgun fungus. I have yet to find a chem that can get this off. The black dot is a left over caseing that shot a mold spore up to 200 ft. It started out white.
If this is not the case and you have some king of bug crap, try ENVRIOSPECKS DELIMONENE I like that stuff. In the beginning I heard it was hard to work with. I think it work's well. You just need to be carefull not to let it dry on windows.
$80 for 55 gal and I use 2 gal of it to 3 gal of H20. Then x-jet it on. Dont let it gather up on the bottom piece of plastic moulding and have it run down a painted or stained post. It will eat the paint off

If mold is on the house I use 1 1/2 gal bleach-1 1/2 gal delimonene and 2 gal water. Works well for me. 2 story,4 bedroom, used 15 gal of mix. So the chems for house washing are cheap. If the x-jet did"nt look like a pot pipe I would gold plate it and wear it around my neck.
Some people e-mail me not to post too much on house washing because lowballers read this stuff.
I figure is they are smart enuff to read this, they are smart enuff to get BLASTMASTER. They did a big artical on this this month. So what I have to say wont do any more damage.
That paper mag. blastmaster is a lowballers wet dream. For $2 a copy they give you direction's on how to use your HOME DEPOT unit to make money.