I would take a scrap piece and scratch it with the back of a key.
Even ZURI, which can stand up to the key test, I do not suggest using a pressure washer on.
For most composites and PVC, you would simply micro-abrasion the surface and lead to the product getting dirtier faster.
Usual prescription is hose down twice a year, once to remove pollen in the spring and again to remove leaf mold/grime in the fall. A soft bristle brush for any tough spots, and follow manufacturers' most updated tech bulletins on removing pitch/etc.
I find the manufacturers and some of the salespeople tend to oversell a product. Trex will state that it is great for a wet application like docks, but both our Meredith and Hampton stores carry PVC decking for that application. Much lighter weight and impervious to moisture.
We also find that we have issues with rail systems that get clogged weep holes over time.
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