Just came back from the boat this weekend and noticed black spots that looked like burn holes in the jell coat. I thought that the recent 4th of July fireworks were a little too close. There were also many spider webs on the outside of the boat also. After chasing down and killing a few hundred spiders I noticed that certain ones were leaving a black stain when they were smashed. The stain is very difficult to remove. Does anyone have experience with removing these spiders and the stains?