If your siding is covered in algae, here is a simple solution to get rid of it, plus why it works, and how to get the job ...

To remove algae buildup, you need friction. She says to spray the bird bath with a solution of warm water and vinegar to loosen the algae. "But the brush is doing the real work. Scrub with a stiff ...

You likely have an algae problem (and pressure washing is not the solution).