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How to Clean Trex Decking – Tips and Tricks

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Trex decking, a popular choice for outdoor living spaces, combines durability with an aesthetically pleasing appearance.

Known for its composite material, which resists rot, warping, and insects, Trex decking has become a staple in backyards across the globe. However, like any outdoor surface, it requires regular maintenance to keep it looking its best.

Understanding how to clean Trex decking properly not only enhances its appearance but also extends its lifespan, making it a worthwhile investment for any homeowner.

What You Will Need

Cleaning Trex decking is a straightforward process, but having the right tools and cleaning agents is essential for effective maintenance.

Here’s a list of what you’ll need:

  1. Soft Bristle Brush: This is crucial for removing dirt and debris without scratching the deck surface.
  2. Garden Hose with Spray Nozzle: For rinsing the deck, a hose with a spray nozzle allows you to control the water pressure.
  3. Bucket: Useful for mixing cleaning solutions.
  4. Mild Detergent: A gentle soap (like dish soap) works well for general cleaning.
  5. Commercial Composite Deck Cleaner: For more robust cleaning, especially for tougher stains, a cleaner specifically designed for composite decking is recommended.
  6. White Vinegar and Baking Soda: For a DIY cleaning solution, these household items are effective, especially for mold and mildew.
  7. Rubber Gloves: To protect your hands, especially when using commercial cleaners.
  8. Safety Goggles: To protect your eyes from splashing water and cleaning solutions.
  9. Pressure Washer (Optional): If using a pressure washer, it should be on a low setting to avoid damaging the deck surface.

Each of these items plays a role in the cleaning process, ensuring that you can tackle any dirt, stain, or buildup that your Trex deck might face.

Understanding Trex Decking

Before diving into the cleaning process, it’s important to understand what makes Trex decking unique. Trex decking is made from a blend of wood fibers and recycled plastics, making it an eco-friendly option for homeowners. This composition provides resistance to many common decking issues such as splintering, rotting, or termite damage. However, the composite material can still accumulate dirt, grime, and stains, which means it requires specific care.

The key to maintaining Trex decking lies in regular cleaning and using the right techniques. Unlike traditional wood, Trex decking does not require painting, staining, or sealing, but it is susceptible to staining from food spills, grease, and mildew. The surface can also become slippery if not properly maintained, especially in damp environments.

Regular cleaning not only keeps your Trex deck looking great but also prevents buildup that can cause long-term damage. For instance, mold and mildew can become more than just an aesthetic issue; they can lead to a breakdown in the decking material if not addressed. Similarly, food and grease stains, if left untreated, can become permanent fixtures on your deck.

Understanding the nature of your Trex decking is crucial for proper maintenance. It’s about striking a balance between regular cleaning to maintain its appearance and avoiding harsh chemicals or cleaning methods that could damage the composite material. With this knowledge, homeowners can confidently approach the task of keeping their Trex deck in pristine condition year after year.

Step-by-Step Cleaning Guide

Cleaning your Trex deck regularly not only maintains its beauty but also extends its life.

Follow these steps for effective cleaning:

  1. Preparation: Remove all furniture and debris from the deck. Sweep the surface to remove loose dirt and leaves.
  2. Basic Cleaning: Mix a mild detergent with warm water in a bucket. Using a soft bristle brush, gently scrub the deck’s surface in the direction of the grain. Pay extra attention to areas that receive high foot traffic or are prone to dirt accumulation.
  3. Deep Cleaning: For tougher stains or accumulated grime, use a composite deck cleaner. Follow the manufacturer’s instructions carefully. Some stains may require specific cleaners (e.g., a degreaser for grease stains).
  4. Rinsing and Drying: Thoroughly rinse the deck with a garden hose to remove soap and cleaner residues. Allow the deck to air dry completely. Avoid using a pressure washer as high pressure can damage the composite material. If a pressure washer is necessary, use it on the lowest setting and keep the nozzle at least 8 inches away from the deck surface.

Tips for Stubborn Stains

Trex decking can occasionally fall victim to stubborn stains such as grease, mold, or mildew. Here’s how to address these:

  • Grease and Oil: Spills should be cleaned immediately to prevent staining. Apply a degreasing agent and scrub gently with a soft bristle brush.
  • Mold and Mildew: In damp environments, mold and mildew can be a common issue. A solution of white vinegar and water can be effective. For persistent mold, a specialized mold remover designed for composite decking is recommended.
  • Rust and Ground-In Dirt: For rust stains and ground-in dirt, a cleaner containing oxalic or phosphoric acid can help. Always test any cleaner on a small, inconspicuous area first to ensure it doesn’t damage the deck’s finish.

Remember, the key is to tackle stains as soon as they occur. The longer a stain sits, the more difficult it will be to remove.

Preventative Maintenance

Preventative maintenance is crucial in keeping your Trex deck in top condition.

Here are some tips:

  1. Routine Cleaning: Sweep the deck regularly to prevent dirt and debris accumulation. A quick wash with soapy water every few months can prevent buildup of grime.
  2. Immediate Spill Clean Up: Clean spills immediately to prevent staining. This is especially important for substances like grease, wine, and barbecue sauce.
  3. Furniture Pads: Use furniture pads under outdoor furniture to prevent scratches on the deck surface.
  4. Avoid Harmful Chemicals: Do not use harsh chemicals or cleaners that are not recommended for composite decking. Chlorine bleach, for instance, can discolor and damage the deck surface.
  5. Seasonal Care: Before winter, clean the deck thoroughly to remove leaves and debris that might trap moisture. In areas with heavy snowfall, use a plastic shovel to remove snow.
  6. Sun Protection: If parts of the deck are exposed to excessive sunlight, consider using outdoor rugs or shading to prevent fading.

By following these preventative maintenance tips, you can avoid many common issues that arise with Trex decking. Regular care not only keeps the deck looking its best but also helps to preserve its integrity for years to come.


When maintaining your Trex deck, certain practices can enhance its longevity, while others can inadvertently cause damage. Here’s a list of dos and don’ts:

  1. Do Use Recommended Cleaners: Stick to cleaners recommended for composite decking to avoid damage.
  2. Do Test Cleaners in a Small Area: Before applying any cleaner or stain remover, test it on a small, inconspicuous area of your deck.
  3. Do Clean Spills Immediately: Promptly cleaning spills can prevent staining.
  4. Do Follow Manufacturer’s Guidelines: Always refer to Trex’s cleaning and maintenance guidelines for the best practices.


  1. Don’t Use Harsh Chemicals: Avoid cleaners with harsh chemicals like chlorine bleach, which can discolor and damage the decking.
  2. Don’t Use a Metal Shovel for Snow Removal: Metal tools can scratch the surface of the deck. Use a plastic shovel instead.
  3. Don’t Apply Paint or Stain: Trex decking is designed to be low maintenance and does not require painting or staining.
  4. Don’t Ignore Routine Maintenance: Regular cleaning is key to keeping your deck in prime condition.


Maintaining a Trex deck involves regular cleaning and immediate attention to spills and stains. By using the right cleaners and techniques, you can preserve the beauty and functionality of your Trex decking for many years. Remember that while Trex decking is low maintenance compared to wood, it still requires care to maintain its appearance and longevity. Regular cleaning, combined with preventative measures, will keep your deck looking great and provide a safe, enjoyable outdoor space.


Can I pressure wash my Trex deck?
Yes, but use a fan tip nozzle with no more than 3100 psi and keep it at least 8 inches from the deck surface to avoid damage.
How often should I clean my Trex deck?
Perform a thorough cleaning at least twice a year. For general upkeep, clean the deck as needed, depending on exposure to dirt and weather conditions.
Can I use a bleach solution to clean my Trex deck?
No, avoid using bleach as it can discolor the decking. Opt for mild detergents or cleaners specifically designed for composite decking.
What should I do if my Trex deck gets scratched?
Minor scratches often blend in over time. For significant scratches, consult Trex’s care and maintenance guidelines or consider contacting a professional.

References and Further Reading

For more information on maintaining your Trex deck, the following resources can be invaluable:
Trex’s Official Website: The best source for specific guidelines and recommendations directly from the manufacturer.
Home Improvement Blogs: Many DIY blogs offer tips and tricks for deck maintenance, often based on personal experiences.
Online Forums: Platforms like Reddit or specialized home improvement forums where homeowners share their experiences can provide real-world advice.
Professional Deck Maintenance Services: Consulting with professionals can offer insights into the best practices for Trex deck maintenance.
By leveraging these resources, homeowners can gain a deeper understanding of the best practices for maintaining their Trex decking, ensuring it remains a beautiful and functional part of their outdoor living space for years to come.