By Kelin
Fri, Feb 20, 2026

What’s the Best Way to Clean Composite Decks?

Composite decking boards are becoming more and more popular in homes due to their durability and low maintenance. Composite decks do not require sanding or staining and last longer than traditional wood decks. However, despite the lower maintenance needs of composite decks, regular cleaning is still key to maintaining their beauty and functionality. This article will detail how to properly clean a composite deck and provide some practical cleaning tips and advice.

Table of Contents

Why are Composite Decks Easier to Clean?

Composite decks are usually made from a mixture of wood and recycled plastic. This composite material makes composite decks more resistant to stains, water, mold, and UV rays than pure wood decks.

EVODEK’s composite decks, for example, offer excellent environmental resilience and longevity. The cleaning process for composite wood decks is relatively simple and does not require the use of strong chemical cleaners.

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Five Steps to Cleaning A Composite Deck

The process of cleaning a composite deck can be broken down into five simple steps. By following these steps, you can ensure that your deck stays clean, looks great, and lasts longer.

Clear The Deck

Before you start cleaning, you first need to clear the deck of all its contents. This includes furniture, potted plants, decorations, etc. This will ensure that you are able to thoroughly clean every corner of your deck.

Remove All Items: Remove tables, chairs, pots, grills, etc. from the deck area.
Remove Debris: Use a broom or leaf blower to remove loose debris such as leaves, twigs, dust, etc. from your deck.
Protect Plants: If there are plants or flowers near the deck, cover them with a tarp to prevent the cleaner from harming the plants.

Prepare The Cleaner

Choosing the right cleaner is key to cleaning your composite deck. Composite deck manufacturers like EVODEK recommend specific cleaners. This ensures that the deck surface will not be damaged.

Choose A Cleaner: Use a cleaner specifically designed for composite decks. If a specialized cleaner is not available, you can use a mild detergent mixed with water.
Prepare Cleaning Solution: Mix the cleaner proportionally with water and pour it into a 5-gallon bucket.
Prepare Tools: Have a deck brush (medium-hard nylon bristles), spray bottle (for spot cleaning), and towel or sponge mop (for drying up standing water).

Deck Partitioning

We recommend cleaning the deck in small pieces. This way, the cleaner will not dry out or evaporate before scrubbing.

Divide the Area: Divide the deck into smaller areas and clean one area at a time.
Apply Cleaner: Apply diluted cleaner evenly to the first area and allow it to dwell for 30-60 seconds. Do not allow the cleaner to dry, or it will leave a residue that is difficult to remove.

Clean The Composite Deck

Use a deck brush to scrub the deck surface vigorously, making sure to remove all dirt and debris.

Scrub with the Grain: Scrub vigorously first in the direction of the grain of the deck and then against the grain to ensure a thorough cleaning.
Tackle Stubborn Stains: For tougher areas, apply cleaner and spot treat with a sponge or brush.
Pay Attention to Corners and Edges: The corners and edges of your deck are prone to dirt buildup and need special attention.

Final Rinse

Once scrubbing is complete, rinse the deck thoroughly with water to ensure no cleaner residue remains.

Rinse the Deck: Rinse the deck with water to make sure all cleaners and dirt are washed away.
Dry Off Standing Water: Use a towel or sponge mop to soak up any standing water on the deck to prevent water damage from remaining.
Repeat Process: Continue cleaning the next area until the entire deck is cleaned.

How to Keep Your Composite Deck Looking Like New?

In addition to regular cleaning, there are a number of routine maintenance practices that can help keep your composite deck looking beautiful and functional.

Daily Maintenance Recommendations

Regular Sweeping: Sweep your deck weekly to remove leaves, dirt, and debris and prevent dirt buildup.
Clean Up Spills Promptly: Immediately clean up spills of food, drinks, or other liquids to prevent stains from forming.
Prevent Mold Growth: Inspect your deck regularly for mold or mildew and clean up promptly.
Protect The Deck: Use a tarp to cover the deck when doing construction or renovation work. This prevents contamination of the deck by cement, paint, and other substances.

Treating Common Stains

Although composite decks are stain-resistant, you may still encounter some stubborn stains. Here are ways to treat common stains:

Mold and Mildew Stains: Scrub with soapy water or a special cleaner, using a pressure washer if necessary.
Food and Beverage Stains: Immediately blot with a dry paper towel, then clean with soapy water.
Grease and Oil Stains: Quickly vacuum up grease and clean with a degreasing detergent.
Pollen: Use a high-pressure water jet to rinse the deck and remove pollen completely.
Hard Water Stains: Scrub with soapy water and a soft bristle brush, and repeat cleaning as necessary.

Precautions for Using A Pressure Washer

As a general rule, you can also choose to use a pressure washer. Pressure washers can effectively clean composite decks, but the following points should be noted when using them:

Use Fan Nozzles: Ensure that the water pressure is evenly distributed to avoid damaging the deck surface.
Control Water Pressure: Keep pressure below 1500 PSI to prevent scratching or damaging the deck.
Maintain Distance: Keep the nozzle at least 6 inches away from the deck surface.
Wash with the Grain: Wash in the direction of the deck’s grain to avoid damage caused by washing against the grain.

Winter Cleaning and Maintenance

Winter snow and ice can be challenging on composite decks. We need to de-ice as soon as possible so that no one slips and gets hurt. Below are suggestions for winter cleaning and maintenance:

Remove Snow: Use a plastic shovel or broom to remove snow from the deck, avoid using a metal shovel as it may scratch the deck.
Dealing with Ice: Use calcium chloride ice melt to melt ice; avoid rock salt or sand, which can leave permanent stains.
Regular Inspections: After the winter season, check your deck for damage or stains, and clean and repair it promptly.

Conclusion

Composite decks are a popular choice for many homes due to their low maintenance and durability. With regular cleaning and proper maintenance, you can ensure that your composite deck remains beautiful and functional. Whether it’s routine sweeping or deep cleaning, follow the proper cleaning steps and use the right cleaners. This will help you easily keep your deck looking its best.

Hopefully, the cleaning guidelines and tips provided in this article will help you better maintain your composite deck. So that you can better enjoy a clean, comfortable outdoor space. If you still have questions about how to clean a composite deck, you can contact us. EVODEK has a professional service team that can solve all your problems.

FAQ

How Often Should I Clean My Composite Deck?

There is no hard and fast rule about how often a composite deck should be cleaned. It is more important to clean as needed to prevent stains from remaining.

Generally, composite decks are cleaned twice a year to remove dirt and debris. Many homeowners thoroughly scrub their decks when the weather is warm enough for outdoor activities and at the end of the outdoor season.

Can I Use A Snow Blower on My Composite Deck?

Some homeowners have large decks. If you have a lot of snow on your deck and you have easy access to the ground, using a hand-powered snow blower to remove the snow may be a good option. But be careful of cutting and damaging your composite deck with the snow blower.

Can I Use Ice Melt or Rock Salt on A Composite Deck?

Calcium chloride ice melt is usually safe for composite decks. This compound melts ice efficiently and does not damage the surface of a composite deck. It will not harm your pet even if they accidentally swallow it.

We do not recommend using traditional sodium chloride, rock salt, or sand. These types of ice melters tend to leave unsightly and permanent marks on composite decks.

What Are The Best Homemade Cleaners?

If you want to make your own cleaner, choose the right solution for your composite deck.

For moisture-resistant composite decking, you can use 2 tablespoons of ammonia-free liquid detergent, 1 gallon of water, 1 pint of topical alcohol, and 1 quart of oxygen bleach. Oxygen bleach is safe for composite decking and helps remove mold. However, avoid using chlorine bleach.

Avoid using homemade composite deck cleaners or polishes when using a pressure washer or power washer. Because the nozzles on the sprayer are so small, any particulate cleaner will clog the nozzles.

What Should I Do if A Stain or Material is Unusually Stubborn and Cannot be Removed?

If you encounter a stain that can’t be removed, consult the deck manufacturer for a list of their approved powerful cleaners. Composite deck manufacturers have an approved list of cleaners for their materials, and this approved list changes over time. If you don’t follow this list, you could damage your deck or void the warranty, so be sure to follow their approved list.