Lilly Miller Moss Out For Roofs And Walks Concentrate 27oz

I applied in the spring to asphalt shingles with numerous areas with moss build up to 1/4 inch. I appeared to die but by fall it had not degraded and fallen off.I decided to manually remove in Fall and noted either 10%-ish re-established or did not fully die. So, I’ve re-applied after manual removal and hopefully what left will die and wash off this winter.Thus, I would echo comments that it may take several applications to kill completely. Subsequently plan on future annual or bi-annual treatments where you have as problems. Given damage it can do to asphalt roofs the cost is minimal.