Is Dawn Dish Soap Safe
for Decking?
60-second answer from Southeast Michigan's most trusted deck builder — voted Nation's Top Deck Builder two years running.
Is Dawn Dish Soap Safe for Decking? Yes — Trex Recommends It
Dawn dish soap is safe for decking — and not just safe, it is the exact cleaning method that Trex officially recommends for their composite boards. If you have been wondering whether Dawn dish soap is safe for decking or worrying about using the wrong cleaner on your investment, you can stop. A simple solution of Dawn, water, a soft-bristle brush, and a garden hose is all you need to keep your Trex deck looking like new.
Video Transcript
Question: "Matt, when I'm cleaning this deck, could I use Dawn dish soap with like, a soft bristle brush or something?"
Matt Kinsler: "Absolutely. Yeah. In fact, that's what Trex recommends. Just a little bit in a five-gallon bucket with some water, and then using a soft bristle brush — similar to what you'd use for a car in the driveway — just scrub the whole deck down and then hit it with the regular hose. And you should be looking good as new."
Dawn Dish Soap Is Safe for Decking: Step-by-Step Cleaning Guide
Cleaning your Trex composite deck with Dawn dish soap is straightforward. Here is the exact method Matt recommends:
✅ The Result: As Matt puts it — "You should be looking good as new." That is the beauty of Trex composite decking: the most effective cleaning method is also the simplest and cheapest one.
Dawn Dish Soap Is Safe for Decking: What to Use and Avoid
Now that you know Dawn dish soap is safe for decking, here is a quick reference for other common cleaning products and tools — so you know exactly what is safe and what to avoid:
| Cleaning Method | Safe to Use? | Notes |
|---|---|---|
| Dawn dish soap + water | ✓ Yes — Trex Recommended | The official Trex-recommended cleaning method |
| Soft-bristle brush | ✓ Yes | Car-wash style brush is ideal |
| Standard garden hose | ✓ Yes | Perfect for rinsing after scrubbing |
| Magic Eraser | ✓ Yes | Great for scuffs, marks, and white railings |
| Pressure washer (under 2700 PSI, fan tip) | Use with Caution | Only if necessary — follow strict guidelines |
| Rock salt or calcium chloride | ✗ Never | Corrodes hidden fasteners and wood framing |
| Metal scrub brush or metal shovel | ✗ Never | Will scratch and gouge the composite surface |
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