The Azek should be washed twice a year also. Though mold cannot eat it either, mold will appear whenever spores and moisture present the condition for the mold to grow then die.
Azek will scratch easier than a composite... and care needs to be taken on certain products - things like sunscreen/lotion - getting on its surface.
But like a composite deck, using a shovel with a plastic edge... and keeping it clean should avoid most of the negatives.
Its greatest use was as a dock material. Very light - more like cedar - compared to PT or composite options. They even make a new version called MAX that can handle a two foot on center substructure here in New England.
And due to width options (4/6/8), it can make a very dramatic statement without a lot of additional cost.
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