How to Clean and Maintain Composite Wood Decking for Long-Term Beauty

Composite wood decking has become a top choice for modern homeowners seeking stylish, durable, and low-maintenance outdoor living spaces. But even though composite decking is designed to withstand the elements far better than traditional wood, it still requires a bit of TLC to keep it looking fresh and performing at its best.

In this guide, we’ll explore how to clean and maintain your composite wood decking, seasonal care tips, what to avoid, and how to preserve its vibrant color, structural integrity, and slip-resistant texture for years to come.

Why Maintenance Still Matters with Composite Decking

While composite wood decking is resistant to rot, splintering, and insects, it isn’t entirely maintenance-free. Dirt, pollen, mold spores, barbecue grease, and everyday foot traffic can dull its appearance or create slippery spots over time.

Proper care ensures:

• Your deck retains its rich color and grain finish
• Stains and mildew are prevented from building up
• Boards stay safe to walk on year-round
• You uphold the manufacturer’s warranty

Tools & Materials You’ll Need

Before diving into deck cleaning, gather a few basic tools and non-abrasive products:

• Soft-bristle brush or broom
• Garden hose with spray nozzle
• Bucket of warm water
• Mild dish soap or composite deck cleaner
• Microfiber mop or sponge
• Optional: pressure washer (used cautiously)

Avoid:

• Steel wool or wire brushes (they scratch the surface)
• Bleach-based cleaners unless approved by your deck brand
• Solvent-based chemicals like acetone or paint thinner

Step-by-Step: How to Clean Composite Wood Decking

Step 1: Clear the Deck

Start by removing:

• Furniture
• Grills or planters
• Loose debris (leaves, twigs, etc.)

Sweep the entire surface with a broom to get rid of dust and dirt.

Step 2: Rinse Thoroughly

Use a garden hose to spray down the deck, loosening stuck-on dirt. This helps prep the surface for deeper cleaning.

Step 3: Mix Your Cleaning Solution

In a bucket, combine warm water with a small amount of mild dish soap or a manufacturer-recommended composite deck cleaner.

Tip: Always test your cleaner on a small, inconspicuous area before applying to the full deck.

Step 4: Scrub Gently

Dip a soft-bristle brush or sponge mop into the solution and scrub the deck in sections. Focus on:

• High-traffic areas
• Grease spots from grilling
• Pollen or mold-prone corners

Always scrub with the grain of the boards to avoid damaging the surface.

Step 5: Rinse Again

Once scrubbed, thoroughly rinse the deck to remove all soap residue. Leftover soap can attract dirt or create a sticky surface.

Let the deck air dry completely before replacing furniture or rugs.

How Often Should You Clean Composite Decking?

• Monthly (light sweep & rinse): Especially in spring and summer
• Quarterly (full scrub): Every 3–4 months
• Post-heavy storms: Remove any standing water, mud, or leaves
• Spring & Fall: Deep clean to remove pollen, mildew, and seasonal buildup

Dealing with Common Composite Deck Issues

Even with regular care, your deck might occasionally need extra attention. Here’s how to handle specific problems:

1. Mildew & Mold

Although composite decking resists mold, mildew can still form on pollen, dust, or damp areas.

Solution:

• Use a composite-safe mold remover
• Scrub with a diluted vinegar solution (1:3 ratio with water)
• Rinse thoroughly and keep shaded areas dry and ventilated

2. Grease & Food Stains

Dropped burgers, oily sauces, or wine spills can stain if left untreated.

Solution:

• Clean stains ASAP with warm soapy water
• For stubborn spots, use a degreaser recommended for composite materials
• Avoid abrasive scrubbing pads

3. Water Spots or Hard Water Stains

These appear after hosing the deck with mineral-rich water.

Solution:

• Wipe the area with white vinegar
• Buff with a soft microfiber cloth
• Use distilled water for final rinsing when possible

4. Scuff Marks or Furniture Drag

Dragging chairs or planters can create minor scuffing.

Solution:

• Use a composite touch-up pen or rubber eraser
• Place rubber feet under furniture to prevent future marks

Can You Pressure Wash Composite Decking?

Yes, but with caution. Most composite decking manufacturers recommend pressure washers under 1,500 PSI and with a fan-tip nozzle held at least 8–10 inches from the surface.

Do:

• Use low pressure
• Rinse, don’t blast
• Test a small area first

Don’t:

• Use high pressure or narrow tips
• Pressure wash frozen or sun-heated boards
• Blast water directly at board edges or joints

Seasonal Maintenance Tips

Spring

• Deep clean to remove winter buildup
• Inspect for mold, leaves, and moisture accumulation
• Reseal hidden fasteners if needed

Summer

• Sweep regularly to remove dust and pollen
• Add UV-protective deck umbrellas to minimize fading
• Clean barbecue spills immediately

Fall

• Remove fallen leaves and moisture traps
• Trim surrounding trees or shrubs
• Deep clean before winter

Winter

• Avoid metal shovels; use plastic to prevent scratches
• Use calcium chloride (not rock salt) for de-icing
• Brush off snow gently instead of letting it freezeWhat Not to Do With Composite Decking

To maintain the beauty and warranty of your composite decking, avoid these common mistakes:

• Don’t use abrasive cleaners or steel brushes
• Don’t ignore standing water or clogged gaps
• Don’t use bleach unless approved by the manufacturer
• Don’t paint or stain unless explicitly permitted
• Don’t drag furniture or planters always lift

Enhancing Longevity: Extra Care Tips

• Use outdoor rugs with breathable backing (avoid rubber mats)
• Add planters with raised feet to prevent moisture buildup
• Use hidden fasteners for a cleaner look and fewer dirt traps
• Keep nearby gutters clean to reduce water pooling
• Invest in deck covers or pergolas for sun protection

When to Call in the Pros

If your composite decking:

• Has persistent discoloration or mold
• Feels spongy or soft in spots
• Shows signs of structural sagging

It may be time to call a professional cleaner or installer. Some companies offer specialty composite deck detailing and surface sealing for added protection.

Final Thoughts

Composite wood decking delivers a perfect balance of beauty and performance but like any outdoor investment, it thrives with regular care. Fortunately, maintaining composite decking is simple and doesn’t require harsh chemicals or back-breaking effort. A monthly sweep, a few seasonal scrubs, and some preventive thinking go a long way in preserving its strength and style.

Whether your deck is your summer hangout zone, a space for quiet mornings, or a showpiece for hosting guests, a clean and well-kept surface makes all the difference. With the right habits and tools, your composite wood deck can look as stunning in year 15 as it did on day one.