All exterior wood, from decks to fences to siding, should be cleaned before sealing, staining or painting. Cleaning is a crucial step to long-lasting protection. It removes the discoloration that makes weathered wood unsightly and will improve the durability of a waterproofer or stain. Before cleaning, protect your eyes, skin, plants and other stationary items in the area. While cleaning, use an appropriate cleaner, power-washer, or a combination of the two, to remove stains from dirt, mildew, mold, algae and prior finishes.
Follow product label application instructions carefully. Allow the formula to sit on the fence for the time indicated on the product label, usually 10-15 minutes. Next, scrub the surface using a stiff bristle brush to remove all elements and then rinse thoroughly.
Avoid lap marks by applying the waterproofer or stain along the vertical boards, moving from top to bottom and working on one or two boards at a time.
For best results, use an exterior paint pad with a long handle.
To prevent lap marks, keep the leading edge "wet" and distribute the finish evenly. Brushes are particularly effective in tight or hard-to-reach spaces.
Follow package directions to clean tools with either mineral spirits or soap and water.