Composite decking is beloved for its durability, low maintenance and natural wood-like appearance, making it a fantastic choice for UK gardens and outdoor spaces. While it resists staining and weathering better than timber, regular cleaning helps maintain its look and prolongs its lifespan. Whether you have a large decking area or a compact balcony, knowing how to clean composite decking correctly ensures it remains an attractive and safe surface year-round.
What You Will Need
Cleaning composite decking requires just a few simple items: a stiff-bristled broom or brush, warm water, mild washing-up liquid, and a garden hose or bucket of clean water for rinsing. Avoid harsh chemicals, abrasive cleaners or steel brushes, as these can damage the surface.
Step-by-Step Guide to Cleaning Composite Decking
Begin by sweeping the deck thoroughly to remove leaves, dust, dirt and loose debris. Clearing the surface first prevents scratching during washing.
Mix a few drops of washing-up liquid into warm water to create a gentle cleaning solution. Use a soft-bristled brush or mop to scrub the decking boards in sections, focusing on any dirty or stained areas. The mild detergent helps lift grease, grime and surface marks without harming the decking material.
After scrubbing, rinse the decking thoroughly with clean water from a hose or bucket. Make sure no soap residue remains, as this can make the surface slippery.
For stubborn stains such as oil, food, or mildew, apply a composite decking cleaner or specialist stain remover recommended by the decking manufacturer. Follow the product instructions carefully, usually involving application, gentle scrubbing and rinsing.
How Often Should Composite Decking Be Cleaned?
Routine cleaning every few weeks during the warmer months helps prevent build-up of dirt and algae. In autumn, clear fallen leaves promptly to avoid staining. After winter, a thorough clean is beneficial to remove moss or grime that may have accumulated.
Can You Use a Power Washer on Composite Decking?
Power washing can be used but with caution. Use a low-pressure setting and hold the nozzle at least 30 centimetres away from the boards to avoid damaging the surface. High pressure or close-range washing can cause surface degradation or water ingress in the joints.
Preventing Future Stains and Build-Up
To minimise dirt and algae growth, trim back overhanging trees or shrubs that shade the decking and increase moisture. Regular sweeping and prompt removal of spills will also keep your decking looking pristine.
Consider applying a composite decking sealant or protector if recommended by the manufacturer. This can enhance stain resistance and ease future cleaning.
In Summary
Cleaning composite decking is a straightforward task requiring gentle detergent, warm water and a soft brush. Avoid harsh chemicals and excessive pressure to maintain the board’s appearance and integrity. With regular care and prompt attention to stains, your composite decking will continue to provide a beautiful, safe and inviting outdoor space for years to come.
