You won’t need to purchase & use one or more products for only cleaning common mold stains, especially those that contain corrosive sodium hypochlorite, the active biocide in chlorine bleach which is scientifically unproven for molds, (see Oregon State Scientific Study on this website), of which mildew is a subspecies, or products that claim to clean and/or prevent but generally take weeks or months to work, if at all.
A 2nd product to clean organic tannin stains generally from the wood of which most composites are partially made or rust, which corrosive to structural metal decking hardware products, specifically those that contain sodium hypochlorite or oxalic acid can cause.
A 3rd product for grease & oil, most commonly from the BBQ. You won’t need to purchase & apply expensive products that claim to seal composites, which can exacerbate cleaning issues by sealing in fungi & stains, or expensive, laborious products to remove sealers when they begin to generally rapidly weather off/crack & look ugly.
The information on this web site should be carefully considered. It will help guide you to why Corte-Clean® is the cost-effective single solution for cleaning & keeping generally long lasting expensive composite decks, docks, & fences clean of all common stains, not just those caused by molds.