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Blog
Home > Blog > How to Remove Mold from Composite Deck?
22Aug
  • By EVODEK
  • Fri, Aug 22, 2025
  • 7785 Views

How to Remove Mold from Composite Deck?

Building decks and outdoor living spaces to accommodate your family can be both fun and exciting. To ensure that your deck will last for a long time, you should know how to use and care for it. In recent years, composite decking material has gradually become a top choice for more and more homeowners. This is because this decking material is not only sturdy and long-lasting, but it also does not require regular maintenance and upkeep work.

Composite decking board is a building trim material made from recycled plastic and wood fibers. Because it has several benefits that wood decking does not have, composite decking has become one of the best alternatives to wood decking. Composite decking has excellent water and mold resistance and is easy to keep clean. All you need to do is use mild soapy water to clean it up and keep your backyard looking great all summer long.

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Table of Contents

  • Tools for Cleaning Composite Decking
  • How to Clean Composite Decking
  • How to Remove Mold from Composite Decking
  • Avoid These Mistakes
  • Summary

Tools for Cleaning Composite Decking

If the composite decking is not too dirty, soap and water will clean it. If it has been a while, you may need to use a specialized composite decking cleaner. Always read the instructions on the bottle before using any deck cleaner.

  • Broom
  • Bucket
  • Mild dish soap
  • Soft-bristled brush
  • Water hose
  • Deck brightener product containing oxalic acid
  • Pressure washer (optional)
  • Leaf blower (optional)

How to Clean Composite Decking

Here are some tips on how to clean composite decking to make your deck look better. These tips apply to most decks, but not necessarily to all. This is because there are many different types of composite decking. That’s why you should read the manufacturer’s cleaning instructions before following our recommendations. In some cases, they may have specific needs.

Before you begin, cover and protect plants in your yard with a tarp that may react adversely to the chemicals used to clean your deck.

  • Sweeping the deck. Use a broom to remove debris, pine needles, leaves, or other things from the surface of the composite decking.
  • Rinse the deck first. Use an outdoor hose or power washer to clean the composite decking. if using a power washer, make sure it is turned down and at least 8 inches above the surface of the deck. This way the power washer will not harm the deck.
  • Spray and scrub with soapy water. Spray all parts of the deck with soapy water and make long brushing motions along the length of the boards. Scrub the composite decking with a soft-bristled brush to remove accumulated dirt.
  • Rinse with clean water. After scrubbing the composite decking with soapy water, rinse it off with clean water. Make sure all the soapy water is rinsed off to avoid leaving spots.
Remove Mold from Composite Deck

How to Remove Mold from Composite Decking

Mold is not only unsightly and harmful to your health, but it also reduces the lifespan of many wood decks. Although composite decking has excellent mold resistance, mold can still appear on the surface of composite decking.

This is because if leaves or other organic debris accumulate on the surface of composite decking, mold may grow on top of the debris. This then causes mold to appear on the surface of the composite decking. Mold can make composite decking boards slippery, so be careful and wear good shoes when cleaning. Follow these steps to remove mold from your deck.

  • Sweep the deck. Use a broom to remove debris, pine needles, leaves, or anything else from the surface of the composite decking.
  • Rinse the deck first. Use an outdoor hose or power washer to clean the deck. If using a power washer, make sure it is turned down and at least 8 inches above the deck surface.
  • Put in baking soda. Spray the mold with the baking soda and vinegar solution. Wait 20 minutes. This allows the solution to break down the mold and make it easier to remove. Then scrub the area with a soft-bristled brush to remove any mold that is still present.
  • Rinse with clean water. After scrubbing the composite decking, give it a good rinse with water to remove any remaining dirt.
Remove Mold from Composite Deck

Avoid These Mistakes

If you want to clean composite decking more easily, don’t do these common wrong things.

Using the Wrong Cleaner

It is essential to use the right cleaner on composite decking because the wrong cleaner can damage the deck’s surface. You should not use deck cleaners that contain bleach because they can cause a lot of damage to composite decking. Therefore, you should use oxygenated cleaners. It will clean both the exterior and interior of the composite decking. In addition, choose a cleaner that will not harm your plants. This will help keep the plants around the decking safe.

Don’t Forget the Crevices

Over time, dirt and other things can stick between the boards. These gaps should be kept clean so that air can pass through. Keep the bottom of the deck dry. This will help reduce the amount of mold that can grow on the bottom of the deck.

Don’t Use the Wrong Tools

All you need for everyday cleaning of composite decking is a broom and a garden hose. However, when you want to clean composite decking more deeply, use a soft-bristled brush. When you clean your decking with a soft-bristled brush, it prevents scratches to the decking and prevents dirt from getting into the crevices. Composite decking users who live in colder areas should use a plastic shovel rather than a metal shovel to clear snow.

Remove Mold from Composite Deck

Summary

A beautiful, clean, and comfortable outdoor deck is the perfect area for you and your family to entertain and relax. It creates an outdoor living space that is perfect for dining, socializing, and relaxing. Make sure your deck stays clean by regularly sweeping and cleaning composite decking. The result is a long-lasting, durable, and beautiful composite decking that avoids mold and mildew problems from lowering your mood.

Related Post

  • Is Composite Decking Worth the Cost?
  • How Long Does Composite Decking Last?
  • Can You Power Wash Composite Wood Decking?
  • How To Avoid Warping of Composite Decking?
Tags:
Cleaning Composite Decking
author avatar
Kelin Content Writer
Kelin is an accomplished writer specializing in outdoor home decor. With a background in landscape architecture and a flair for storytelling, Kelin creates compelling content that inspires homeowners to enhance their outdoor living spaces. His writing covers a range of topics from garden design and furniture placement to the latest trends in outdoor living. Known for his practical advice and innovative ideas.
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Content Marketing Home Decor Outdoor Design

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