New Thread with my results of first test

[Watermom]

Ok. Didn't know that.

[Tom.B]

While I am not sure it's on the vertical sides, it's certainly on the angled sides. However, it's not in a shady area or any real area in particular. It's spread evenly throughout. There are some green/yellow spots on the stairs, but that's all I can see in the way of concentrations.