Cleaning a wooden deck removes dirt, algae, and loose finish, but excessive pressure can scar the soft grain and create raised fibers. A controlled wash begins with a sound surface and ends with enough drying time for the next maintenance step.
Inspect and clear the deck
Move furniture and sweep leaves from between boards. Check for loose fasteners, soft wood, lifted edges, and damaged railings. Replace or repair unsafe boards before washing so water does not hide a structural problem.
Protect the surroundings
Wet nearby plants with clean water and cover delicate items. Direct runoff away from doors, foundations, ponds, and storm drains. Choose a cleaner labeled for the deck’s wood and existing finish; do not mix products.
Use low, even pressure
Apply cleaner in manageable sections and use a soft deck brush. If a pressure washer is permitted, keep the nozzle moving, use a wide fan, and maintain a generous distance from the boards. Never concentrate the spray on one spot or aim into cracks and joints.
Rinse and dry completely
Rinse until suds and residue are gone, then allow several dry days with good airflow. Do not sand or seal damp boards. Once dry, lightly smooth raised fibers if needed and inspect the end grain before applying a compatible finish.
Regular sweeping and prompt removal of leaves reduce the need for aggressive cleaning. If boards splinter, discolor unevenly, or remain soft after washing, replace them or consult a deck professional.