How to Clean a Wooden Deck Properly (2025 Guide)

Your wooden deck is looking dull, covered in grime, and maybe even sporting some mold after months of harsh weather. You want to enjoy outdoor gatherings, but the stained, slippery surface is a safety hazard. The right wooden deck cleaning can restore its beauty and extend its lifespan. In this guide, we’ll cover step-by-step methods, the best cleaning solutions, and maintenance tips. For stubborn stains, consider using a specialized deck cleaner.

Key Takeaways

• Sweep and pre-rinse to remove loose debris before deep cleaning.
• Use mild soap or a vinegar solution for gentle yet effective cleaning.
• Scrub with a stiff brush to lift embedded dirt without damaging wood.
• Apply a sealant annually to protect against moisture and UV damage.

1. Remove Debris and Furniture

Start by clearing the deck of furniture, planters, and rugs. Sweep away leaves, dirt, and twigs with a stiff broom or leaf blower. Pay attention to corners and between boards where debris accumulates. For stubborn particles, use a putty knife to dislodge them. This step prevents scratches during scrubbing and ensures even cleaning.

2. Pre-Rinse the Deck

Use a garden hose or pressure washer (on low setting) to wet the surface. Avoid high-pressure settings, which can splinter wood. Pre-rinsing loosens dirt and prepares the wood for cleaning solutions. For moldy areas, a mix of water and oxygenated bleach (EPA-approved) helps kill spores without harsh chemicals.

3. Choose the Right Cleaning Solution

Pick a cleaner based on your deck’s condition:

• Mild soap & water: Safe for routine cleaning.
• Vinegar solution (1:1 water): Natural option for mildew.
• Commercial deck cleaner: For deep stains or composite decks.

Avoid bleach-heavy products, which can weaken wood fibers. For pet stains, try a pet-safe cleaner.

4. Scrub the Surface

Use a stiff-bristle brush or deck scrubber to work the solution into the wood. Scrub along the grain to avoid damage. Focus on high-traffic areas and stains, but don’t oversaturate the wood. For composite decks, opt for a soft brush to prevent scratches.

5. Rinse Thoroughly

Rinse from one end to the other, ensuring no soap residue remains. Leftover cleaner can attract dirt or cause discoloration. If using a pressure washer, keep the nozzle 12 inches away to avoid etching the wood.

6. Let the Deck Dry

Allow 24–48 hours for complete drying before applying sealant or replacing furniture. Check for damp spots—especially in shaded areas—to prevent mold regrowth.

7. Apply a Protective Sealant (Optional)

Once dry, apply a waterproof sealant or stain to shield against UV rays and moisture. Reapply every 1–3 years, depending on wear. For eco-friendly options, choose plant-based sealants like USDA-certified products.

Summary Table: Wooden Deck Cleaning Steps

Regular cleaning keeps your deck safe and visually appealing. For tougher jobs, like grease stains from grills, a degreaser can help. With these steps, your wooden deck will stay in top shape for years!