Still fairly new to soft washing, have done multiple brick houses and other exteriors walls, all have turned out excellent. Starting to practice on friends roofs to really tone my craft. I am just not getting the results I want, attached is a photo of a roof I did today, I used a 4% pure CH mix with surfactant. You can clearly still see brown patches. Does anyone have advice on 1) what these patches are and 2) how to properly remove? This is the 2nd roof I have done with same result.
Ok just checking. Kinda looked like leftovers and since it was near the bottom of the pitch I figure I would ask. Cant go wrong with 50/50… we tend to tweak it down for roofs with discoloration and no moss.