Corte-Clean® was designed to be used from the time composites are new, throughout their life-cycle, which is generally the length of their warranty. Failure to properly thoroughly clean composites made from exposed wood fibers of what is known as “tannin bleeding”, & especially those additionally made from dirty recycled plastic (milk jugs, shrink wrap, cheese wrappers, etc.), of this & other dead organic dirty matter that lands on composites from which molds, mildews, lichens, mosses & algae can feed has resulted in them being infamously notorious for fungi growth, & rapid re-growth, especially if chlorine bleach or other or common scandalous deck cleaners that contain sodium hypochlorite have been previously used. Once composites are thoroughly Corte-Cleaned® of their inherent flaw and/or the numerous problems caused by the previous use of other cleaners, proactively routinely using Corte-Clean®, at the reduced “routine cleaning” strength, to remove new stains & stain causing derbies, such as mold spores (seeds) that have landed since. This is why most, if not all, composite manufacturers recommend & Corte-Clean® was designed for semi-annual cleaning, “at least twice yearly, spring & fall, or when stains appear”, to keep composites clean. Generally, the more routinely Corte-Clean® is initially applied, less & less is applied, the more time, labor & money is generally ultimately saved.