I washed a house this weekend that had the dreaded BLACK SPOTS. I have read all the posts on the search I could find but there seems to be no easy method of removing this beast. Luckily the other power washers in my area are at a loss too as to what works. I've heard them called everything from spider eggs to tar spots. Is there anyone out there who has a simple answer?? One post mentioned a citrus cleaner that worked. I had luck with gasoline on a small area but I'm not about to tackle a large area on a house with an accellerant like that!!! I have never run into a problem getting paid if I couldn't get it off but I would like to know just out of curiosity!!