Introduction: Why Redwood Decks Need Special Care

Redwood is one of the most popular decking materials in California thanks to its natural beauty, durability, and resistance to pests. But as strong as redwood is, it’s still a softwood, which makes it vulnerable to cracking, fading, and surface damage if cleaned incorrectly. Many homeowners think a quick blast with a pressure washer is the solution, but that often causes splintering or deep cuts in the wood.

Cleaning a redwood deck properly requires the right cleaning agents, correct pressure settings, and post-cleaning protection. In this article, we’ll break down the step-by-step process for safely cleaning a redwood deck, the best products to use, and tips for keeping your investment looking great for years.

Step 1: Inspect the Redwood Deck Before Cleaning

Before you even think about applying water or chemicals, take time to inspect the deck.

• Check for cracks or splits: Redwood naturally develops surface checking (hairline cracks). These are normal but can worsen if you blast the wood with high pressure.
• Look for mold, mildew, or moss: Especially in shaded or damp areas.
• Check fasteners and boards: Loose nails or warped boards should be fixed before cleaning.

👉 Pro Tip: Document the condition with photos. This helps you compare the before-and-after results and track areas that may need sealing.

Step 2: Prepare the Area

Redwood decks are often connected to landscaping or near pools, so preparation is key.

1. Remove all furniture, rugs, and décor.
2. Cover nearby plants and fragile surfaces with tarps or plastic sheeting.
3. Ensure the deck has proper drainage and runoff won’t pool near the house.
4. Put on personal protective equipment (gloves, safety glasses).

Step 3: Choose the Right Cleaning Solution

This is where many homeowners go wrong. Using bleach or harsh chemicals can strip redwood of its natural oils, leaving it brittle and faded. Instead, use:

• Oxygenated Deck Cleaner (Sodium Percarbonate-based)
  • Safe on redwood, biodegradable, and highly effective at breaking down organic buildup.
  • Mix per manufacturer instructions (usually 4–8 oz per gallon of warm water).
• Avoid chlorine bleach unless you’re dealing with severe mold — and even then, dilute heavily (0.5–1% SH max).

👉 Why oxygenated cleaners? They lift dirt and organic matter gently without damaging fibers or leaching color like bleach.

Step 4: Apply the Cleaner Properly

1. Wet the deck first with a garden hose to reduce absorption of the cleaner.
2. Apply oxygenated solution evenly across all boards with a pump sprayer or watering can.
3. Let it dwell for 10–15 minutes, but don’t let it dry. Keep misting lightly if needed.
4. Agitate with a stiff bristle deck brush (never metal) to lift dirt and stains.

Step 5: Gentle Rinse vs. Pressure Washing

Pressure washing can be used, but with extreme caution:

• Keep PSI low (500–800 max) when rinsing redwood.
• Use a 40° fan tip or soft-wash system.
• Stay at least 12–18 inches away from the surface.

👉 Alternative: A soft wash rinse (low pressure, high volume) is much safer and still removes debris effectively.

Step 6: Neutralize and Brighten (Optional but Recommended)

After cleaning, redwood can sometimes appear dull or slightly darkened. A wood brightener helps:

• Oxalic Acid is the standard brightener. It restores redwood’s natural reddish tones and neutralizes any leftover cleaner.
• Apply per directions (usually 4–6 oz per gallon).
• Let sit for 10 minutes, then rinse thoroughly.

👉 This step is especially important if you plan to seal or stain the deck.

Step 7: Drying and Sealing

Redwood decks should be allowed to dry 48–72 hours before sealing. Skipping this step can trap moisture and cause peeling.

• Choose a penetrating oil-based sealer specifically for redwood or cedar.
• Apply with a pad applicator or sprayer in thin, even coats.
• Wipe off any excess to avoid shiny or sticky spots.

Sealing not only enhances color but also protects against UV damage and moisture intrusion.

Common Mistakes to Avoid

• Over-pressuring: More pressure ≠ cleaner deck. It just causes damage.
• Skipping prep: Not moving furniture or covering plants can lead to chemical stains.
• Bleach overuse: Too strong a mix can bleach the redwood permanently.
• Not neutralizing: Forgetting oxalic acid leaves the deck looking “washed out.”

Redwood Deck Maintenance Schedule

To maximize your deck’s lifespan:

• Sweep weekly to remove leaves and dirt.
• Wash annually with oxygenated cleaner.
• Re-seal every 2–3 years depending on sun exposure.

By following this cycle, you’ll prevent buildup, minimize cracking, and keep your deck looking beautiful.

Why Hire a Professional for Redwood Deck Cleaning?

While DIY is possible, redwood requires skill and the right equipment. Professionals use blend manifolds, soft washing systems, and deck-specific cleaners to get the job done without risk.

Hiring a pro ensures:

• Proper cleaning ratios and methods.
• Protection of surrounding landscaping and property.
• Long-term preservation with sealing and maintenance plans.

For Bay Area homeowners, professional redwood deck cleaning means less stress, better results, and avoiding costly mistakes.

Conclusion

A redwood deck is an investment worth protecting. Cleaning it correctly involves more than blasting it with high pressure — it’s about using the right chemicals, gentle washing, and proper sealing. With this step-by-step process, you can restore the rich, natural look of redwood while extending the life of your deck.

If you’d rather skip the hassle and get a guaranteed professional finish, reach out to Window Cleaning Bay Area. Our team specializes in pressure washing, soft washing, and wood restoration across the Bay Area.

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