It can take between a couple of weeks and a couple of months to eliminate the organic matter. This depends on the porosity of the surface, penetration of the stain and what type of organic growth you are trying to remediate. After Wet and Forget eliminates the stain, it will protect the areas that have been sprayed for up to 12 months from any new growth from forming!
Wet and Forget can be used on almost any surface without staining in, because it has no bleach. This means awnings, outdoor rugs, outdoor furniture, etc. now can be cleaned without worrying about staining the surface!
NOTE: The surface must be exposed to rain water, or it must be hosed down periodically to wash the organic matter off the treated surface.