Artillery Fungus is a serious cleaning challenge. You can find several home-brew recipes that don't work all over the net. The only thing that works is breaking through the outer shell of every spot and getting a good cleaner into the core. You have to keep the surface moist and let it soak as long as you can. Sometimes washing with a hot water pressure washer can help.

With your professional efforts and Artillery Fungus and Spore Remover you can successfully remove black spots from building surfaces caused by artillery fungus. Get the best prices on pressure washing chemicals equipment & accessories at Sun Brite Supply