Deck Washing: Cleaning Methods & Maintenance Tips

When it comes to exterior cleaning, deck washing  should be your number 1 priority. Deck washing helps to keep the deck well-maintained, and extends its lifespan. Regular cleaning prevents mold, mildew, and grime from building up, which can damage the deck surface and make it slippery. 

Even though composite decks require less upkeep that regular wood decks, they still benefit from routine cleaning to get rid of dirt and stains and keep their original finish and color. 

Here’s how to properly wash and maintain composite and wood decks.

Cleaning Methods for Composite Deck Washing

Composite decks are durable, but they’re still prone to surface dirt, mold, and mildew. Here are some effective, gentle methods for keeping composite decks looking new.

1. Start with Surface Debris

Before applying any cleaner, sweep the deck to remove leaves, dirt, and debris. This minimizes staining and prevents damage from trapped moisture.

2. Use Eco-Friendly Cleaning Solutions

For environmentally friendly cleaning, a vinegar solution is excellent for composite decks. Mix equal parts water and white vinegar, apply with a soft-bristle brush, and scrub gently to tackle stains and mildew. Baking soda can also be effective; simply sprinkle a bit on stubborn spots and scrub in small circles.

3. Choose the Right Composite Deck Cleaner

Composite decks can sometimes require stronger cleaners. Look for composite deck cleaners that are eco-friendly, specifically designed for mold and mildew removal, and safe for composite surfaces.

4. Light Pressure Washing

If stubborn stains remain, a gentle-pressure power washer (usually below 1,500 psi) can help. Use a fan tip and keep the nozzle 8–12 inches from the deck’s surface to avoid damage. Only use a pressure washer when necessary, as frequent use can degrade the deck’s surface over time.

5. Semiannual Cleaning

For best results, plan to clean your composite deck twice a year. This prevents buildup and helps catch early signs of mold or mildew.

Cleaning Methods for Wood Deck Washing

Wood decks require different care than composite, as wood is more susceptible to weathering, moisture, and staining. 

Here’s a breakdown of effective methods to keep your wood deck in top shape.

1. Start with a Sweep and Inspection

Begin by sweeping away dirt, leaves, and other debris. Check for loose nails, splinters, or damage, as addressing these issues early can prevent accidents and larger repairs.

2. Select a Natural or Commercial Cleaner

For wood decks, oxygen bleach is a safe and powerful cleaning agent. Mix it with water as directed, scrub the surface with a stiff-bristle brush, and rinse with a hose. 

Alternatively, you can use a commercial deck cleaner designed specifically for wood, which often includes mold and mildew removers for deep cleaning.

3. Try a Vinegar and Baking Soda Solution

A natural cleaner using vinegar and baking soda can effectively tackle mold and mildew. First, apply the vinegar solution (one part vinegar to one part water), then sprinkle baking soda over stubborn stains. Scrub the areas with a stiff brush, rinse thoroughly, and let the deck dry.

4. Pressure Washing for Deeper Cleaning

A pressure washer can also be useful for wood decks, but it’s essential to use a lower pressure (around 500-600 psi) to prevent splintering. Use a fan tip and maintain a safe distance from the surface.

5. Brightening and Conditioning

A wood brightener can restore the wood’s natural tone, especially if it’s been weathered or exposed to sunlight. After cleaning and drying, apply the brightener, let it sit as directed, and rinse. Consider following up with a deck sealer or stain for added protection.

Recommended Cleaning Solutions and Materials

Different solutions and materials can help maintain both wood and composite decks effectively.

1. Homemade Cleaning Solutions

For a DIY approach, mix ammonia-free dish soap with warm water for a gentle yet effective deck cleaner. Vinegar and baking soda are also excellent for removing mold and mildew on both wood and composite surfaces.

2. Eco-Friendly Cleaners

Eco-friendly deck cleaners, such as those with oxygen bleach or plant-based ingredients, can keep your deck looking new without introducing harmful chemicals to the environment.

3. Essential Tools

• Soft-Bristle Brush: Gentle enough for composite decks and tough enough to remove grime.
• Stiff-Bristle Brush: Ideal for scrubbing wood decks, especially for tougher stains.
• Garden Hose with Nozzle: Effective for rinsing off debris without damaging the deck surface.
• Pressure Washer (with Fan Tip): Only for occasional deep cleaning on composite or wood decks, at low pressure.
• Brush with Extension Pole: Useful for reaching all areas without having to bend or strain.

Deck Preparation and Maintenance

After cleaning, proper preparation and maintenance are important to preserving your deck’s appearance and durability.

1. Inspect and Repair

Before cleaning, inspect the deck for loose nails, cracks, or splinters. Sand down any rough areas with fine-grit sandpaper and replace any loose or rusty nails to prevent accidents.

2. Deck Sealing and Staining

Sealing or staining your deck, especially if it’s wood, protects it from moisture, mold, and warping. A good-quality deck sealant will lock out water and extend the life of your deck.

Deck sealing is especially important if you own a pool deck as poolside decks are frequently exposed to water and require extra protection. 

3. Resealing Frequency

For wood decks, reseal every 1–2 years. Composite decks generally require less sealing, though checking with the manufacturer’s recommendations is wise.

4. Protect Against Weather Exposure

Placing an outdoor rug or shade covering over high-traffic areas helps shield the deck from UV rays and moisture damage, extending the deck’s longevity.

Protect and Preserve Your Deck with Cajun Softwash

Keep your deck looking its best with a deep, professional clean from Cajun Softwash! 

Our team is skilled in the best deck washing techniques, including safe and effective pressure washing and mild, environmentally friendly solutions. We’ll help you get rid of mold, mildew, and dirt from your wood or composite deck so that it remains a beautiful secure surface.

If you’re curious about how our process works, try it before you buy it with our 100% free, no-obligation roof inspection and demo. Our team, led by a former ASHI Certified Inspector, will give you an honest assessment, offering a free soft-wash demo to show just how transformative our service can be.