Black spots on siding
These spots are often caused by spiders, especially true when you're near water. Bet your boat will have spots too, if you have one. If you walk out on your deck or outside and find yourself running into spider web then this may be it. One helpful cure is to go out at night with a flyswater and a flashlight. Use the light to spot the spider and swat it. They wil eventually be replaced by other spiders. They aren't out in the daytime. They are out at night and like building near lights as the lights attract bugs. The black spot are supposed to be spider excrement. I found podwer oxiclean to be the best remover of these spots. I mixed some in warm water and used a brush where i could reach. It made the spots dissolve easily. I had vinyl siding and saw no hurt in using it, so I don't know how it will affect other types of sidings.