How to Clean and Refinish a Weathered Wood Deck

WEATHERED wood decks are often mistaken for being beyond repair when they turn gray and splintery, but that surface layer is simply dead wood fiber waiting to be removed. Reviving a deck is one of the most rewarding home projects because it bridges the gap between a neglected eyesore and a functional outdoor living space, significantly extending the life of the lumber beneath. Success here depends entirely on your patience during the cleaning and drying phases. If you rush the drying process or skip the sanding, the finish will fail within a single season. A well-done refinish looks uniform, protects the grain from moisture, and feels smooth underfoot, turning the deck back into the heart of your backyard.

Tighten and clear the deck. Remove all furniture, planters, and debris. Sweep the deck thoroughly to remove loose dirt and leaves, then inspect the surface for protruding nail heads or loose screws.
Loosen the gray layer. Spray a deck cleaner specifically formulated for removing graying and mildew onto the boards. Work in small sections, allowing the solution to sit for the manufacturer's recommended time without letting it dry out.
Rinse clean with care. Rinse the cleaner away thoroughly. If using a power washer, keep the tip at least 12 inches from the wood and move in long, even strokes to avoid leaving permanent gouges in the soft grain.
Wait for bone-dry wood. Wait at least 48 hours for the deck to dry completely. The wood must be bone dry before you apply any finish, or the moisture trapped beneath will cause the stain to peel.
Smooth the entire surface. Use a deck sander or a pole sander with 60 to 80-grit sandpaper to remove raised grain and splinters. Focus on getting a uniform texture across the boards to ensure even stain absorption.
Penetrate the grain deeply. Use a high-quality penetrating oil-based stain. Apply it using a long-handled brush or pad, working it into the wood grain along the entire length of the board to avoid overlap marks.