I just water down windex about half and half in the pressure washer cleaner jug. Spray it on with soap nozzle in sections small enough so won’t evaporate, then, with widest spray nozzle (at least 40 degree nozzle or more) rinse off 3 or 4 foot from wall. Works for me. IMO one of good things with stucco it don’t get moldy, at least mine never does. The draw back are you have seal and surface cracks so moisture won’t get behind stucco. About ever vinyl house I see has mold especially on north sides.
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