35% Hydrogen Peroxide mixed at 1:50 should do the trick. "frank stefek" <frank.stefek at btopenworld.com> wrote in message news:b213hq$k8o$2 at sparta.btinternet.com... > One of my customers has a big problem with moss on his roof and walls. > Can anyone tell me of a good Moss Killer witch is easily obtainable and easy > to use? > > Frank > > >