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How to Clean Composite Decking: A 6-Step Guide

 

If you own a wood deck, you likely dread the annual ritual of sanding, sealing, and staining. But if you’ve upgraded to composite decking—especially TimberTech—you’ve already cut out much of the time and cost of traditional deck maintenance. That said, even composite decks need a little TLC to keep looking their best.

The good news? Cleaning composite decking is quick, easy, and inexpensive when done correctly. Unlike wood, composite decks don’t require sanding or staining. With the right tools and techniques, it’s a simple weekend task that’ll leave your deck looking refreshed and ready to impress.

In this guide, we’ll show you how to clean TimberTech Advanced PVC and Composite Decking in 6 easy steps:

  1. Clear the deck

  2. Remove loose debris

  3. Prepare the cleaning solution

  4. Divide the deck into sections

  5. Scrub and rinse

  6. Dry and spot-check

Step 1: Clear the Deck

Move all furniture, planters, and accessories off your deck to expose the full surface. Be sure to lift items instead of dragging them to avoid scratches.

Step 2: Remove Debris

Use a broom or leaf blower to sweep away leaves, sticks, and dust. Don’t forget corners and in-between deck boards, where dirt and moisture can collect. Cover nearby plants to protect them from cleaning agents.

Step 3: Prepare the Cleaner

Gather your materials:

  • TimberTech® DeckCleaner™ (or a mild soap like Dawn)

  • 5-gallon bucket

  • Garden hose with spray nozzle

  • Recommended brush (see below)

  • Measuring cup

  • Spray bottle (optional)

  • Terry cloth towels, sponge mop, or leaf blower

Brush Types:

  • Use a stiff natural fiber brush for TimberTech Advanced PVC

  • Use a medium-stiff nylon brush for TimberTech Composite Decking

Dilute the TimberTech cleaner per label instructions—1 gallon should clean up to 1,000 sq. ft. Test any other cleaner first to confirm it’s safe for your material.

Step 4: Section Off the Deck

Clean your deck in small, manageable areas. Spray or pour the cleaning solution on the first section and let it sit for 30–60 seconds—but don’t let it dry before scrubbing and rinsing. Work during cooler parts of the day to avoid fast evaporation.

Step 5: Clean and Rinse

Scrub with the grain and across it to get into the board’s texture. After scrubbing, immediately rinse with clean water in the direction of the grain. Avoid getting cleaner on railings or siding.

Pro Tip:
Use a plastic bucket or towel to mark your place—decks look similar when wet, and it’s easy to lose track.

Power washing? Yes, but only for rinsing, and only with:

  • Max 1,500 PSI

  • Fan-tip nozzle

  • Wand kept off the deck surface

Step 6: Dry and Spot-Check

Dry with a sponge mop, terry cloths, or a leaf blower, moving in the direction of the grain. This helps reveal any missed spots that may need extra attention.

Best Cleaners for Composite Decking by Problem Type

Problem Solution
Stains Spot clean with TimberTech® DeckCleaner™ or a mild soap solution
Snow/Ice Use a plastic shovel (never metal!)
Mold/Mildew Scrub with cleaner and proper brush
Grease/Oil Blot immediately and use a degreasing agent
Tannins Caused by leaves—sweep regularly and follow standard cleaning steps

Always follow your manufacturer’s recommendations for safe products and tools.

Maintenance Tips to Keep Composite Decking Like New

  • Sweep off leaves and dirt regularly

  • Spot clean mud, paw prints, and spills promptly

  • Clean at least twice per year—ideally in spring and fall

  • Avoid dragging heavy items across boards

  • Protect decking during nearby construction or painting projects

If you have a tough stain or an issue not listed above, contact TimberTech’s support team before using any unapproved cleaner or tool.

Considering a New Deck?

If you’re tired of scrubbing your wood deck each year, it may be time to upgrade. TimberTech decking offers the look of wood with the ease of composite care. Call Classic Remodeling to get a free quote on your deck.

FAQs

Why are composite decks easier to clean?
They’re moisture-resistant and fully capped, which helps prevent staining, fading, and mold.

Can I use dish soap?
Yes, diluted dish soap works for light cleaning, but TimberTech’s cleaner offers better results.

Can I power wash my deck?
Yes—but only for rinsing. Keep PSI below 1,500 and use a fan-tip nozzle.

How often should I clean my composite deck?
At least twice per year, or as needed. Clean more often if you live in a humid or debris-heavy environment.

Final Thoughts

Composite decking makes life easier—but a clean deck makes your outdoor space shine. With these simple steps, you can enjoy a beautiful, low-maintenance deck year-round.