How can I clean spider/insect pooh from my vinyl siding? Powerwashing does nothing. I've tried simplegreen (full strength); soft scrub, and bleach. Seems I have to first scrape off the black raised specks, then scrub with bleach to remove the stain. It took me 3 hours to do a 3x8 section. There has to be an easier way or a better cleaning solution. Help? I had a guy look at it and said he has never seen it as bad on a house as ours.

probably not bugs (repeat)