Five tips for cleaning your composite deck

Cleaning composite decking is simple and requires far less maintenance than timber. In most cases, all you need is warm soapy water, a soft brush and a quick rinse to keep your deck looking its best.

How to Clean Composite Decking (Quick Guide)

• Sweep away dirt and debris
• Rinse the deck with water
• Apply warm soapy water
• Scrub gently with a soft brush
• Rinse thoroughly

This simple process is usually all that’s needed to keep your decking clean and well maintained.

1. Plan Your Deck Cleaning Around the Seasons

For most composite decks, cleaning twice a year is enough. A spring clean prepares your deck for summer use, while an autumn clean removes dirt and debris before winter.

In shaded or high-traffic areas, more regular cleaning may be needed.

2. Sweep Away Debris First

Before cleaning, remove any furniture and sweep away leaves, dirt and debris. This makes the cleaning process quicker and more effective.

If dirt is trapped between boards, gently remove it using a suitable tool before washing.

3. Use the Right Deck Cleaner

Warm soapy water is safe and effective for most composite decking. It’s affordable, easy to use and works well for general cleaning.

Avoid harsh chemicals or abrasive tools, as these can damage the surface. For tougher stains, use a specialist composite deck cleaner and always test first.

4. Be Careful with Pressure Washing

Pressure washers can be used carefully, but should be kept at a low setting to avoid damaging the boards.

• Keep pressure below 3100 PSI
• Hold the nozzle at least 4 inches from the surface
• Move continuously to avoid damage

In most cases, a brush and soapy water will do the job without the need for pressure washing.

5. Work in Small Sections

Cleaning in smaller sections prevents the solution from drying too quickly, especially in warm weather.

This helps avoid residue and makes it easier to achieve an even finish across the deck.

Why Composite Decking Is Low Maintenance

Unlike timber decking, composite boards don’t require sanding, staining or sealing.

They are designed to resist fading, staining and mould, making them a practical long-term choice for busy outdoor spaces.

If you’re comparing options, read our composite vs timber decking guide or find out whether Trex decking is worth it.

Planning a New Deck?

If you’re starting a project, choosing composite decking can significantly reduce long-term maintenance.

Explore our composite decking range or see Trex decking costs to plan your project.