How to Clean Composite Decking: The Definitive Guide

Welcome to the ultimate resource on how to clean composite decking! If you own a composite deck, you know it looks great and is easy to care for. However, to keep your outdoor haven looking its best and lasting for years, understanding the best way to clean a composite deck is crucial.

This guide will cover everything you need to know about how to clean composite decking. It includes general upkeep and how to tackle stubborn stains.

Article Contents

Introduction to Composite Decking Cleaning & Care

Composite decking has become a popular choice for homeowners exploring the best decking materials. It offers the beauty of wood without the hard maintenance. Made from a mix of wood fibers and recycled plastic, these boards resist rot, warping, and insect damage. They offer clear benefits over regular wood. To make your investment last longer and look good, it is important to understand how to care for composite decking. This includes knowing how to clean it properly.

This guide will illuminate the best way to clean composite decking and maintain its pristine condition.

The Importance of Regular Composite Deck Cleaning

While composite decks boast lower maintenance needs compared to wood, regular cleaning is far from optional. Neglecting to clean composite decking can lead to several undesirable outcomes:

• Unsightly Buildup: Environmental elements deposit dust, pollen, and grime. Organic materials like leaves and bird droppings can further detract from your deck’s appearance. Over time, this buildup can become stubborn.
• Composite Decking Mold Growth: Wet and shaded areas can lead to mold and mildew growth. This can cause discolored patches and make surfaces slippery. Knowing how to remove mold from composite decking is vital.
• Staining Issues: Spills, particularly from food, grease, and even some beverages, can leave permanent marks if not addressed promptly. Learning how to clean stains on composite decking is essential for maintaining its beauty.

Consistent cleaning enhances their aesthetic appeal and contributes significantly to how long a composite deck should last.

General Guide on How to Wash Composite Deck

For routine upkeep, a general wash is typically all that’s needed to clean the composite deck. Here’s your step-by-step guide on how to wash composite decking, along with the items you’ll need.

Items You’ll Need

• Broom or leaf blower
• Bucket
• Warm water
• Mild dish soap or a specialized composite deck cleaner
• Soft-bristled brush
• Garden hose with a spray nozzle
• Optional: Clean cloth, sponge mop or leaf blower (for drying)

Step 1: Pre-Cleaning Prep

• Begin by clearing your deck entirely. Remove all furniture, planters, and any other items to ensure unobstructed access to the entire surface.
• Use a broom or leaf blower to thoroughly remove loose dirt, leaves, twigs, and any other surface debris. Pay close attention to the gaps between the deck boards and the corners where detritus tends to accumulate.

Step 2: Choosing Your Cleaning Solution

For a standard clean composite decking, you have several effective options:

• Mild Soap and Water: A simple solution of warm water mixed with a gentle dish soap often works wonders for general dirt and grime.
• Specialized Composite Deck Cleaners: Numerous best cleaners for composite decks are available, formulated specifically for composite materials (e.g., TimberTech Deck Cleaner, Corte Clean). Always adhere to the manufacturer’s instructions for optimal results. Some homeowners also explore a homemade cleaner for composite decking.

Step 3: The Scrubbing Process

• Apply your chosen cleaning solution evenly across the deck surface.
• Using a soft-bristled brush (consider a composite deck cleaning brush), gently scrub the deck. Work along the grain of the boards and also across them to effectively lift dirt from the textured surface. Avoid stiff metal brushes that could scratch the composite.

Step 4: Rinsing Thoroughly

Once you’ve scrubbed the entire area, rinse the deck completely with a garden hose. Use moderate pressure to ensure all soap residue is washed away. Leftover soap can attract more dirt.

Step 5: Drying

Allow the deck to air dry naturally. To speed up the process, use a leaf blower. You can also wipe away any standing water with a clean cloth or sponge mop. Be sure to move with the grain of the boards.

Deep Cleaning Guide for Composite Decking

When your deck needs more than a surface clean, it may have dirt or mold. In this case, a deeper cleaning is needed. Here’s how to clean composite decking more intensely:

Step 1: Initial Preparation

As with general cleaning, start by ensuring the deck is clear of all items and loose debris has been removed.

Step 2: Applying a Deep Cleaning Solution

For a deep clean, use a special composite deck cleaner for tough stains. You can also mix oxygen bleach (sodium percarbonate) with warm water. Be sure to follow the product’s instructions carefully. Some also explore cleaning composite decking with vinegar for its natural cleaning properties.

Step 3: Vigorous Scrubbing

Use a medium-stiff bristled brush to scrub the affected areas more thoroughly. Pay extra attention to areas with visible dirt buildup or mold. For railings, a composite deck railing brush can be particularly useful.

Step 4: The Role of Pressure Washing

• Power washing composite decking can be an option for rinsing in a deep clean, but it must be done with extreme caution. Use a pressure washer with a fan tip nozzle. Keep the pressure low, usually under 1500 PSI. Always check with your manufacturer. Keep the nozzle at least 8-12 inches away from the deck surface and move it in a consistent sweeping motion along the grain.
• Incorrect pressure washing can damage your composite deck. Some manufacturers provide specific guidelines on whether you can power wash.

Step 5: Final Rinse

Ensure all cleaning solutions are completely rinsed off the deck with a hose.

Step 6: Drying

Allow the deck to dry completely.

Addressing Common Stains on Composite Decking

Knowing how to clean stains on composite decking is crucial for maintaining its appearance. Here’s how to tackle common issues:

• General Stains: Act quickly! Wipe up spills immediately with a clean cloth. For lingering marks, try mild soapy water or a dedicated composite deck stain remover.
• Snow and Ice: Use a plastic shovel for removal to prevent scratching. For melting, check if your manufacturer recommends specific ice melt products.
• Composite Decking Mold: For mold and mildew, a solution of one part white vinegar to four parts water can be effective. Apply, let sit briefly, scrub gently, and rinse well. Several composite deck mold cleaner products are also available.
• Oil and Grease: Absorb as much as possible with paper towels, then use a degreasing dish soap and warm water. Rinse thoroughly.
• Dirt and Debris: Regular sweeping is key. For embedded dirt, follow the general cleaning steps.
• Tannin Stains: Promptly remove wet leaves. For existing stains, you may need a composite deck cleaner or a deck brightener. Make sure it has oxalic acid and is safe for your decking material. Research if oxalic acid works on composite decking for your specific brand.
• Removing Stains from Composite Decking: For persistent stains, a specialized composite deck cleaner and restorer might be necessary. Always test in an inconspicuous area first.

Regular Preventative Composite Deck Maintenance

Beyond just cleaning, proactive care will keep your composite decking looking its best:

• Sweep Regularly: Prevent buildup by sweeping frequently.
• Prompt Spill Cleanup: Address spills immediately to avoid staining.
• Use Entry Mats: Minimize tracked-in dirt.
• Protect During Projects: Cover your deck during painting or construction.
• Ensure Good Airflow: Proper ventilation helps prevent moisture buildup and mold growth.

Important Considerations & Tips for Cleaning Composite Decks

• Always follow the cleaning instructions from your composite decking manufacturer. This includes how to clean Timbertech, Azek, and Fiberon decking.
• Brush Selection: Use the recommended brush type for your material.
• Avoid Drying Cleaners: Don’t let cleaning solutions dry on the surface.
• Gentle Approach: Avoid harsh chemicals like bleach or ammonia. Explore a natural deck cleaner if preferred.
• Test Products: Always test new cleaners in an inconspicuous area first.

Ready for a Deck that’s Easier to Keep Clean?

At Sidex, we are your trusted siding and deck contractor. We offer high-quality composite decking solutions that are beautiful and easy to maintain. Get a quote for your next project!

Composite Decking Cleaning FAQs

Why is composite decking easier to clean?

 Its capped design resists moisture and staining.

Can you use dish soap to clean a deck?

Yes, for general cleaning.

Can you pressure wash a composite deck?

For rinsing only, with low pressure and a fan tip, following manufacturer advice.

What is the best way to clean a deck?

Follow manufacturer guidelines and use appropriate cleaners and tools for your deck material.

How often do you clean composite decking?

Typically twice a year for a thorough clean, with regular sweeping and spot cleaning as needed.