We had times of a sample and have it tested at a smaller place in the last year. This year is the wall there is still as white as snow! Now we have this pack also consumed filled sprayer in a compressed air (weeds) (undiluted) and applied to the affected area. The walls were previously black in some places, was sprayed all orange (algae) and then we just left so. 2-10 hrs act (with us it was already after half an hour clean!) And also not be easy or abregnen. Stinks course really nasty after Clor but it helps, and we observe times as long on this side now house all so beautiful remains white.
