How to Clean Composite Decking: A Step-by-Step Guide

Composite decking is a popular choice for homeowners due to its durability and low maintenance. But it still requires regular cleaning to maintain its aesthetic appeal and longevity. Whether you’re getting ready for a summer barbecue or preparing for winter storage, here’s a step-by-step guide on how to clean composite decking.

Table of Contents

• Step 1: Gather Necessary Cleaning Supplies  
• Step 2: Sweep the Deck  
• Step 3: Prepare the Cleaning Solution
• Step 4: Clean the Decking Surface  
• Step 5: Rinse Thoroughly  
• Step 6: Dealing with Stubborn Stains  
• Step 7: Dry and Inspect the Deck
• Preventative Maintenance Tips

Step 1: Gather Necessary Cleaning Supplies

Before starting, make sure you have the right cleaning supplies. You’ll need:  

– A soft-bristle broom or leaf blower to remove debris.  

– A garden hose or pressure washer with a low-pressure setting (if using).  

– A bucket for mixing cleaning solution.  

– A sponge or soft cloth to scrub the surface.  

– Mild soap or composite deck cleaner that is safe for your decking material.  

– Optional: A deck brush with soft bristles for stubborn dirt and a cleaning solution for mold or mildew stains.

Avoid using harsh chemicals, abrasive brushes, or power washers on high settings, as these can damage the surface of your deck.

Step 2: Sweep the Deck

Start by sweeping your deck with a soft-bristle broom or using a leaf blower to remove dirt, leaves, and other debris from the surface. Regular sweeping is essential to prevent debris from getting embedded in the grooves of the decking, which can result in stains or trapped moisture that may lead to mold growth.

If you don’t clean the surface regularly, dirt and leaves can build up and create stubborn stains over time.

Step 3: Prepare the Cleaning Solution

Once the deck is free of debris, mix a cleaning solution. You can use a mild soap (like dish soap) mixed with warm water, or purchase a specialized composite deck cleaner. Always check the manufacturer’s recommendations for the best cleaning solution for your specific deck.

Before applying any solution to the entire deck, test it on a small, inconspicuous area to ensure it doesn’t discolor the surface.

Step 4: Clean the Decking Surface

Using your sponge, soft cloth, or deck brush, apply the cleaning solution to a small section of the deck. Gently scrub the surface in a circular motion to remove dirt, grime, and any mold or mildew that may have accumulated.

Work in sections to ensure you don’t leave cleaning solution on the deck for too long. It’s also a good idea to clean in the direction of the wood grain or the deck’s natural lines to avoid streaking.

Step 5: Rinse Thoroughly

Once you’ve scrubbed the deck, rinse it thoroughly with a garden hose. Ensure you remove all the soap and debris from the surface. If you’re using a pressure washer, set it to a low-pressure setting to avoid damaging the composite material. Always keep the nozzle a few feet away from the deck surface to prevent any high-pressure water from infiltrating the deck’s seams.

Step 6: Dealing with Stubborn Stains

Sometimes, certain stains—like grease, mold, or mildew—can be more challenging to remove. Here’s how to tackle them:  

– Mold and mildew: Mix a solution of 1 part bleach to 1 part water and scrub it onto the affected areas with a sponge or cloth. Rinse thoroughly after treatment.  

– Grease stains: Use a dish soap or specialized degreaser to break down grease stains. For tougher stains, you may need to apply the solution and let it sit for a few minutes before scrubbing.

Always test cleaning solutions on a small area first to avoid any potential damage.

Step 7: Dry and Inspect the Deck

After rinsing the deck, allow it to air dry completely. Inspect your deck for any areas that may need a little more attention. If the surface looks clean, you’re done! If there are still visible stains, you may need to repeat the process or try a different cleaning solution.

Regular cleaning should be done once or twice a year, with additional spot cleaning as needed.

Preventative Maintenance Tips

To keep your composite decking in top condition, follow these preventative maintenance tips:  

– Clean up spills immediately to avoid staining.  

– Consider using a protective deck cleaner once or twice a year to help maintain its appearance.  

– Trim back plants or bushes around your deck to prevent debris buildup.  

– For added protection, consider applying a UV protectant to keep the colors from fading, though some composite decks already come with UV protection built in.

If your manufacturer recommends sealing the deck, follow their instructions for protective coatings to help resist dirt and stains.

Cleaning your composite decking regularly is an essential part of maintenance to keep it looking great for years to come. Learn how to clean composite decking effectively. By following these steps—sweeping, scrubbing, and rinsing—you can easily clean the composite deck and extend its lifespan. With a little care and attention, your composite decking will continue to shine, providing a stylish, low-maintenance outdoor space.

For more guides on choosing and caring for wood composite decking, visit ecobuildhome.com.