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Use either a spray nozzle on your garden hose or a power washer. Additionally, you may need to scrub the deck with a large brush and a mild laundry detergent, and use a narrow tool, such as a putty knife or small hand saw, to remove debris stuck between decking boards.
To protect the deck, apply a finish that is water repellant or waterproof, offers UV protection and has a wood preservative. Finish can be applied with brushes, rollers or sprayed on. Follow all manufacturer directions, and reapply as directed, every one to four years.