How to Clean a Wood Deck: Step-by-Step Guide
The right way to clean a wood deck depends on the type of wood, but there are general guidelines you can follow. I’ve put the most important things you need to know into one guide.
Key Points
Quick Takeaways
- Choose a deck cleaner based on the wood species, existing finish, and type of buildup
- A brush and garden hose are safer starting points than high-pressure washing for most wood decks
- Let the deck dry to the finish manufacturer’s requirements before applying stain or sealant
What You Need to Clean a Wood Deck
For most deck cleaning, you only need the right cleaner, a wood-safe scrub brush, a broom, a bucket, and a garden hose. A pump sprayer can help apply the cleaner evenly.
How Often Should You Clean a Wood Deck in Greater Seattle?
Cleaning needs depend on your deck and its location. A sunny deck in Bellevue may dry quickly, while a shaded deck elsewhere may stay wet much longer. Annual cleaning is a good general guideline, but let the deck’s condition determine the schedule and clear debris from drainage gaps several times a season when needed, even if a full wash is not.
How to Clean a Wood Deck Step by Step
It’s not as difficult as many people think, but it does require a certain approach and consistency. I’ve put together five steps to help you keep your deck in good condition.
Step 1: Clear the Deck
Clear everything off the deck so you can inspect the surface underneath. Use a broom or leaf blower for dry debris, but do not push it into the gaps between the boards, where it can cause drainage problems later. If you have anything sitting on the deck, such as planters, it should be moved because moisture can collect underneath. Even when the deck does not need a full cleaning, items like these should be repositioned from time to time to prevent damp spots from forming.
Step 2: Choose a Cleaner That Is Safe for the Wood
Choose one based on what you need to remove and the type of wood.
| What You Need to Remove | What to Use |
|---|---|
| Dirt | Mild wood-safe detergent |
| Mildew or organic stains | Oxygen-based cleaner |
| Old stain or sealer | Finish remover made for decks |
| Tannin or rust stains | Compatible wood brightener |
| Growth on cedar | Cedar-approved cleaner |
Always follow the manufacturer’s instructions.
Step 3: Apply the Deck Cleaner
Read the cleaner instructions carefully and mix the cleaning solution exactly as directed. Protect nearby plants, then apply the cleaner to small sections with a sprayer or brush. Let it sit for the recommended time instead of scrubbing too hard, and rinse it off before it dries.
Step 4: Rinse the Deck
A garden hose is usually enough to rinse off the cleaner once you’ve worked through all areas of the deck. If you prefer, you can use a wide-spray nozzle to speed up the rinsing process. Make sure no cleaning solution is left behind anywhere on the surface.
Step 5: Let the Wood Dry Completely
Let the deck drain and dry completely before putting planters or furniture back. Drying time depends on shade and weather, but it often takes more than 24 hours. Apply stain or a protective coating only after the wood is fully dry and follow the manufacturer’s instructions.
Can You Pressure Wash a Wood Deck?
Some wood decks can be pressure washed, but the safe pressure depends on the wood species, its condition, the nozzle, and the distance from the surface. Follow the decking or finish manufacturer’s instructions, use the lowest effective pressure with a wide fan tip, and test a small area first. Do not pressure wash soft, deteriorated, or splintering boards because excessive pressure can damage the wood.
Real Wood Deck Renovation Case in Magnolia, WA
Our Magnolia deck renovation is a good example of a project completed by the GotRot team in Seattle. Cleaning is often when homeowners finally see what winter debris was hiding. Solid but weathered wood surfaces may only need refinishing, while soft boards require a closer look. If the damage has reached the framing, cleaning alone will not solve it.
See the completed project here.
Found Rot or Damage While Cleaning Your Deck?
The deck cleaning process may reveal that the problem goes beyond leaves and debris and that delayed maintenance has already led to rot or other damage.
Call us at (206) 990-0303 or request a free estimate through our website, and we’ll help you address the problem. We serve homeowners across King and Snohomish counties and have more than 10 years of experience repairing rot and deck damage.
FAQ
What should you avoid using to clean decking?
Avoid chlorine bleach, highly caustic cleaners, stiff wire brushes, and excessive pressure on wood decking. These can damage wood fibers, discolor the surface, or harm nearby plants and metal fasteners.
Can I use a pressure washer to clean my wood deck, and what are the safety tips?
Use a pressure washer only when the wood and its finish allow it. Select the lowest effective pressure and a wide fan tip, maintain the distance specified by the manufacturer, and test a small area first. Never aim the spray at people because high-pressure water can cause a serious injection injury. Electric models must have functioning GFCI protection, and the equipment should be checked for active safety recalls before use.
When should you clean a wooden deck?
Clean a wood deck when dirt, mold and mildew, algae, or organic debris begins to build up and before applying a new stain or sealer. Choose a mild, dry day so the cleaner does not dry too quickly and the deck has enough time to dry afterward.
Can I use Dawn dish soap to clean my wood deck?
Use dish soap only if the decking or finish manufacturer specifically allows it. Otherwise, use a cleaner formulated for the wood and its existing finish because dish soap can leave residue that interferes with stain or sealer adhesion.