Can You Pressure Wash Composite Decking?

Composite decking is a popular choice for homeowners who want a durable, low-maintenance outdoor space. 

However, when it comes to washing the deck, many people wonder “Can you pressure wash composite decking and is it okay to do so?”. While pressure washing can be a quick way to remove dirt, grime, and stains, it can also cause damage if not done correctly.

When Should You Clean Composite Decking?

Regular cleaning helps remove dirt, debris, and stains that can accumulate over time, keeping the deck looking fresh and making sure that it remains safe to walk on. 

Ideally, composite decking should be cleaned at least twice a year, during spring and fall, to prepare it for the changing seasons. These times of the year are perfect for removing any buildup of dirt, pollen, or mildew that may have accumulated, especially after wet or humid conditions.

You should also clean your composite deck whenever you notice spills, stains, or signs of mildew. Food, grease, or drink spills should be addressed promptly to prevent staining. 

Similarly, areas with shaded or damp conditions might develop mold or mildew, which should be cleaned as soon as they are noticed. If you live in a region with heavy rain or snow, it’s a good idea to clean the decking after the season to remove grime or salt residues.

For high-traffic areas, more frequent cleaning may be necessary to tackle wear and dirt buildup. Always follow the manufacturer’s cleaning recommendations, using a gentle cleaning solution and a soft brush to avoid damaging the composite material.

Can You Pressure Wash Composite Decking or Should You Use a Gentler Cleaning Method?

Pressure washing can be a quick and convenient method to clean composite decking, but it must be approached with caution to avoid unintended damage. 

While composite decking is designed to be durable and low-maintenance, using high-pressure settings or improper techniques can lead to costly problems. The good news is that, when done correctly and carefully, pressure washing can be a safe and effective cleaning method—but it’s not always the best option. 

Soft washing often provides a gentler, safer alternative for maintaining your deck’s appearance and integrity.

Potential Risks of Pressure Washing

If pressure washing is not performed correctly, it can create a series of issues that compromise both the appearance and structural integrity of your deck. Using a pressure setting that is too high or holding the nozzle too close to the surface can cause “etching,” which leaves permanent cosmetic damage. 

Additionally, the protective finish on composite decking, which is important for repelling moisture and preventing mold, can be stripped away by overly aggressive cleaning. 

Once this finish is compromised, moisture can seep into the material, leading to mold or mildew growth that can spread and become nearly impossible to remove. This may necessitate premature repairs or replacement, significantly increasing long-term maintenance costs.

Tips for Safe Deck Cleaning When Using the Pressure Washing Technique

If you choose to pressure wash your composite decking, always follow the manufacturer’s guidelines. Use a fan-tip nozzle and set the pressure to no more than 1,500 psi. Keep the nozzle at least 8-12 inches from the deck surface and work in the direction of the grain to prevent etching. 

For many homeowners, however, soft washing remains the preferred choice. It minimizes risks, is easy to perform, and ensures your deck stays beautiful and protected for years to come.

Why Soft Washing Is a Better Option

Soft washing is a safer alternative for cleaning composite decking. Soft washing efficiently eliminates grime, algae, and mildew without damaging the deck’s surface or protective coating by combining a moderate, biodegradable cleaning solution with a low-pressure spray. 

Unlike pressure washing, which relies on force to clean, soft washing is designed to be less abrasive while still delivering excellent results. It’s particularly well-suited for composite decking, which benefits from minimal physical stress during cleaning.

How to Clean Your Composite Decking Without a Power Washer

If you prefer a safer and more traditional approach to cleaning your composite decking without risking damage from a pressure washer, you can follow these steps. While this method may take a bit more time, it effectively cleans your deck while preserving its integrity.

Steps to Clean Your Composite Decking

1. Clear the Deck
   Start by removing all furniture, fixtures, decorations, and accessories from the deck. This ensures you have full access to clean every inch of the surface.
2. Sweep Thoroughly
   Use a broom, vacuum cleaner, or leaf blower to remove dirt, dust, and debris. Pay extra attention to the gaps between boards to clear out hidden debris.
3. Rinse with Water
   Using a garden hose, rinse the entire deck to loosen any stuck-on dirt and prepare the surface for cleaning. This step also removes any remaining debris.
4. Prepare a Cleaning Solution
   In a bucket, mix a mild cleaning solution. A simple combination of dishwashing soap and water works well, or you can use a mixture of vinegar and baking soda. Avoid harsh chemicals like bleach or chlorine, as they can damage the composite material.
5. Scrub Gently
   With a soft-bristle brush, scrub the deck surface along the grain to remove dirt and stains. If you have a large deck, divide it into smaller sections to ensure even cleaning. Be mindful not to let the cleaning solution dry on the surface.
6. Rinse Again
   After scrubbing, rinse the deck thoroughly with clean water. You can use a garden hose or pour water manually to ensure no soap residue is left behind.
7. Let It Dry
   Allow the deck to air dry completely before returning furniture and decorations. While waiting, take the opportunity to clean the items you removed to maintain the overall cleanliness of your outdoor space.

Restore and Refresh your Composite Decking with Cajun Soft Wash 

Cajun Soft Wash delivers expert cleaning services tailored for residential and commercial properties. We specialize in cleaning and maintaining a variety of properties, including shopping centers, restaurants, office buildings, apartment complexes, and more. 

We’ll take care of algae-covered roofs, walls, and decks or take care of those bothersome black stains on your concrete.

Keep your property looking clean and welcoming year-round with Cajun Soft Wash.