Trex decking is a popular alternative to wood decks, and the 25-year, residential-use warranty is the main reason. Made from recycled materials and environmentally friendly, Trex decks are still susceptible to both mold and mildew if debris and soil is allowed to accumulate on the surface of the decks. There is a basic process to remove mold from Trex decks, and it’s not too difficult to perform the task.
Sweep the deck, taking care to remove all loose dirt, leaves and debris from the surface of the decking.
Hose down the deck, using a garden hose to saturate the entire surface.
Mix 1 tbsp. dish soap into 1 gallon of hot water.
Apply the soapy water to the Trex deck surface, using a soft-bristled scrub brush and scrubbing in a circular motion on the areas that have mold growing on the decking.
Soak the soapy deck for 15 minutes to allow the soap time to kill the mold spores.
Rinse the entire surface using a garden hose until the water running off the deck is free of soap bubbles. Allow the Trex decking to air dry completely before using.