How to Clean a Wood Deck (and When to Seal It)

A wood deck can turn gray, slippery and stained over time. A good cleaning once a year, followed by sealing when needed, keeps it safe and beautiful.

What You'll Need

A broom and putty knife
Oxygen bleach deck cleaner (or oxygen bleach powder)
A stiff-bristle deck brush
A garden hose
Gloves and eye protection

Step 1: Clear and Sweep

Remove furniture and planters. Sweep the deck and use a putty knife to clear debris from between boards.

Step 2: Protect Plants

Wet nearby plants with water and cover them with plastic if needed.

Step 3: Apply Cleaner

Mix an oxygen bleach-based deck cleaner according to the package directions. Apply it to the deck on a cloudy day or when the deck is shaded, so it doesn't dry too fast. Let it sit for 10–15 minutes.

Step 4: Scrub

Scrub the boards with a stiff brush, following the wood grain.

Step 5: Rinse

Rinse thoroughly with a hose.

Pressure Washing

A pressure washer can damage wood if used incorrectly. If you use one, choose a low setting, a wide-angle tip, and keep it at least 12 inches away, moving with the grain.

Step 6: Let It Dry and Seal

Let the deck dry for at least 48 hours. Test whether it needs sealing: sprinkle water on the boards. If it soaks in quickly, it's time to apply a deck sealer or stain.

FAQ

Can I use chlorine bleach on a deck? It can damage wood fibers and harm plants. Oxygen bleach is a better choice.

How often should I seal a deck? Usually every 1–3 years, depending on the product and weather.