Is azek better than trex? For its part, Trex tends to collect mildew and dirt a little more than Azek , and the same wood fibers that help give it a natural look can make it more susceptible to moisture. These two factors mean that Azek is often a better choice for coastal or wet environments, while Trex excels in areas with prominent seasonal swings.Can you pressure wash azek? Power Washing. AZEK Deck can be cleaned with a power washer using the FAN setting. PSI should not exceed 1400, this said, always, before spraying the deck, test the pressure on an inconspicuous or scrap piece of the deck to make sure the pressure setting does not harm the deck surface.What is azek trim made out of? AZEK Trim is a versatile product made of cellular PVC. It is manufactured in white, to readily accept all paints and stains.AZEK Trim is available in 12’, 18’ and 20’ lengths.What is an azek material? AZEK is a cellular PVC material that's made using weather-resistant technology. The core contains no wood fibers.