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The yuck is on the Trex steps leading to the deck.
I assume that it's a moss or lichen rather than a mold, but, at any rate, search engine results from the experts are contradictory. One says stiff brush with a solution of tri-sodium phosphate, bleach, and water, another says soft-bristle brush with soapy water. The only thing on which they seem to agree is any pressure wash must be at a very low setting. I don't have a pressure cleaner anyway so that's a non-issue.
First- I wouldn't have Trex; but that's beside the point.
You have to understand what you're dealing with to know how to remedy the situation. Trex is sawdust and plastic grocery bags. As the Trex becomes worn due to traffic it exposes the raw sawdust- that's the "food" of the moss/lichens. Then a combination of water and little to no direct sunlight and you have a garden!
I'd probably just use a putty knife to remove the bulk of the plant life then a through washing with a water/bleach solution and a soft bristle brush. The last thing you want to do is expose more sawdust to the elements and spur more growth.
A regular washing will probably keep growth at bay.
I gave up on cleaners that don't work. The deck is almost 20 years old and composite/trex/whatever. I just power wash it without solution. I don't blast material away but do the fan motion and get the black grime off and that works just fine.
You could also remove the Trex (sorry, I know that's not helpful. I just happen to hate Trex. Slippery as snot much of the time in my climate. Friends of mine with a Trex boardwalk leading to their house don't even use it...there is a little footpath along side the boardwalk).
YOu have a little accumulation of mold in an area which gets moisture but not much sunlight. Use "Housecleaner" or a mild solution of bleach and water. Wet the area. Brush on the solution and brush with a medium bristle brush. It will turn into a green slop. Rinse it off. Problem will be solved for some time to come. VERY unusual for Trex or other composite flooring to degrade.
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(sorry, I know that's not helpful. I just happen to hate Trex. Slippery as snot much of the time in my climate. Friends of mine with a Trex boardwalk leading to their house don't even use it...there is a little footpath along side the boardwalk).
