If your deck is gray, weathered and discolored, but not yet deteriorated. Hammer down any nails and loose boards. Spray deck with bleach or a cleaning solution. The solution will make a foaming action to let you know it's working. Let foam work into the wood for about 5 to 10 minutes or what's recommended by the manufacturer. Don't allow the solution to dry. Scrub with a brush and then rinse. Let the deck dry for at least 48 hour. Then apply a semitransparent stain or clear finish.
