Hi every one I'm thinking of trying to start washing roofs and houses and drive ways and I'm the type person I always look before I jump l o l . I've been reading everything and anything on all this on what chemicals to use and not use and so on . there's no doubt I'll probably get a fatboy system to rinse and apply chemicals but all this store bought or Internet chemicals I'm not so sure of.i need a simple but effective mix.ive been looking at roofs here in northern ala and they are very very black and dirty, so I see money waiting to be made but don't want to mess up and spend money replacing my mistakes.any info would be great