It’s the day of your long-awaited backyard barbecue. The grill is fired up, the drinks are chilled, and everything feels perfect—until you notice your deck. Dirt, stains and a suspicious green patch in the corner have turned your once-pristine Trex decking into an eyesore. Sound familiar?
Don’t let a dirty deck ruin your outdoor gatherings. With its low-maintenance design, Trex decking is built to shine—but it still needs a little care to look its best. Follow this step-by-step guide to clean your Trex deck and restore its like-new look, ensuring your space is always ready to impress.
What Makes Trex Decking Unique?
Trex has revolutionized outdoor deck materials with its blend of reclaimed wood fibers and plastic, offering durability and resistance to warping, splintering and rotting.

Designed to endure harsh elements like UV rays, rain and frost, Trex maintains its rich, wood-like charm. While it requires minimal upkeep, regular cleaning ensures its beauty and longevity, particularly in high-traffic areas.
Why Cleaning Your Trex Deck Matters
Routine cleaning is key to maintaining Trex decking’s appeal and protecting it from environmental damage. Watch for these common issues.
Dirt & Debris
Over time, dirt and leaves can settle into the deck’s texture, making it look dull and grimy.
Mold & Mildew
Moisture can lead to mold growth in shaded or damp areas, which not only looks unsightly but can also become slippery.
Stains
Grease from barbecues, spilled beverages or rust from outdoor furniture can leave stubborn marks if not addressed promptly.
Addressing these issues early ensures your deck stays safe, beautiful and ready for use anytime.
Step-by-Step Guide to Cleaning Trex Decking

1. Gather Your Supplies
Start with the right tools to avoid damaging your deck. Here’s what you’ll need.
Soft-bristle brush
Use a soft-bristle brush to prevent scratches on composite surfaces.
Mild soap or deck cleaner
A bucket of warm, soapy water works for most jobs. For tougher stains, opt for a specialized composite deck cleaner.
Garden hose or power washer
Use a garden hose with a spray nozzle or a power washer set to 1500 PSI or lower.
Optional: A putty knife or plastic scraper for debris caught between boards.
2. Prepare the Deck
Remove any furniture, planters or outdoor accessories. Sweep the deck thoroughly to clear leaves, dirt and loose debris. Pay special attention to gaps between the boards, where debris can get lodged. A putty knife or scraper can help with hard-to-reach spots.
3. General Cleaning
Fill a bucket with warm water and a few drops of mild dish soap. Dip the soft-bristle brush into the soapy water and scrub the deck gently. Work in small sections, moving along the grain of the deck boards to avoid scratches.
This method effectively removes surface-level dirt and restores the deck’s natural sheen.
4. Tackling Tough Stains
Use a cleaner specifically designed for composite decks for grease stains, mold or rust.
Apply the cleaner directly to the stained area and let it sit for 10–15 minutes. Scrub the spot gently with the brush and rinse thoroughly. Avoid using bleach or harsh chemicals, as they can damage the deck’s finish.
5. Rinse Thoroughly
Rinse the entire deck with a garden hose or a low-pressure power washer.
Ensure all soap and cleaner residue is removed to prevent streaking or discoloration. For best results, rinse from one end to the other to avoid uneven drying.
6. Inspect and Repeat
After the deck dries, inspect it for missed spots or persistent stains. Repeat the cleaning process for any remaining trouble areas.
How to Clean Trex Decking During Winter
Winter weather brings unique challenges for outdoor surfaces. Trex decking, while resilient, benefits from careful handling during snowy months. Here’s how to keep your deck in top shape.

Snow Removal
Use a plastic shovel to clear snow and avoid metal tools that could scratch the surface. For light snow, a broom works well.
De-icing Products
Opt for calcium chloride-based ice melts, which are safe for composite materials. Avoid rock salt, as it can leave residue and damage the surface.
Aftercare
Once the snow melts, rinse the deck to remove any salt or de-icing chemicals. This step prevents potential staining and keeps your deck looking fresh.
Quick Tips for Year-Round Trex Deck Care
Consistency is key when it comes to keeping your Trex deck looking its best. Try to make these protective measures part of your weekly routine.

Regular Sweeping
Clear leaves, dirt and debris from the surface weekly to prevent buildup.
Protective Measures
Use outdoor furniture pads to avoid scratches and place mats under grills to catch grease.
Seasonal Checks
Inspect your deck for debris after storms or seasonal changes and clean as needed.
Preventive Cleaning
If your deck is in a shaded area or near trees, clean more frequently to prevent mold growth from trapped moisture.
Why Choose McHenry Deck Builders for Your Outdoor Space
A well-maintained Trex deck is more than just an outdoor feature—it’s the foundation for countless memorable moments, from backyard barbecues to quiet mornings with coffee. By following these simple cleaning steps and incorporating regular maintenance into your routine, you can keep your deck looking new for years to come.
At McHenry Deck Builders, we understand the importance of creating durable, low-maintenance decks that enhance your lifestyle. Whether you’re maintaining your current deck or dreaming of a custom outdoor space, we’re here to help. Contact us today to learn how we can bring your vision to life.