Charlie, I think the spots you are talking about are actually spider crap. There are plenty of cleaners that will work, but the very best thing is to prevent the spots by killing the spiders. I use this stuff called VIPER; I spray it up in the rafters and on the underside of the roof of my boathouse at the beginning of summer, and it lasts about 3 months. It is a concentrate you mix with water and use a pump sprayer. I get it at my local Farm & Ranch store. $42 for a 12oz. bottle, but that will last several seasons. Wear eye protection, mask, long sleeves, etc.
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