Any ideas on how to remove mildew stains from Trex brand decking?

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We had Trex installed about 4 yrs ago and although it is nice to never have to stain again, the mildew really shows on it. It's difficult to clean as most deck cleaners are not suitable for composite decking (stating that right on the product container). The deck looks terrible. As an aside, anyone planning on using this material should be aware that it does fade - a lot. Ours gets a ton of sun and has it ever faded.

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