What is that green stuff on the north side of my house? It is just on that side and not on any other. I have no idea how to get it off of there or how I would reach the second story on a ladder with a hose. While that does bother me most about my house, the rest of it could use a good cleaning also. A company that does house cleaning St Louis would be able to get it clean for me. They would wash the green, brown and black from my white house. I want someone who is professional.