Answer by
AnkurMohta (114)
You have two options:-
If you have money, buy yourself a clean roof.
Spray the product, take out a scrub brush and scrub the infected area keeping the area moist. Take a regular garden hose and wash it off. All dead fungus will wash off with the next rain.
You are right the chemical reaction will knock it out, however this will not stop re ocurrence the only way to do that is to kill, it then protect the surface by keeping it dry. Using a protection system for stone or wood add a comment