Before you begin

  • Use in well-ventilated area and only as directed.
  • A trial patch is recommended before starting. Test on an inconspicuous area before applying to entire surface.
  • DO NOT MIX WITH ANY OTHER PRODUCTS, especially those containing chlorine or bleach (sodium hypochlorite).
  • Avoid spraying on windy days.
  • Prior to spraying, close all windows and doors within area in which you are working.
  • Remove all deck furniture and decorative items that could come in contact with Thompson's® WaterSeal® Deck Cleaner & Brightener. Do not allow product to come in contact with painted or finished surfaces that you do not intend to restore.
  • Saturate the ground around plants and shrubs with fresh water prior to application. Then cover all plants and shrubs to protect them from overspray. Uncover promptly after use.
  • Wear a long-sleeved shirt, pants, eye protection and rubber gloves. Do not allow Thompson's® WaterSeal® Deck Cleaner & Brightener to come in prolonged contact with clothing, carpet or fabric, as damage may occur.
  • Remove any loose dirt and debris from wood. If wood is extremely dry or in direct hot sunlight, wet with water.
  • Plan the application: for horizontal surfaces, work backwards so you do not walk on the surface being treated. For vertical surfaces, work from the bottom up. Treat small areas at a time.
  • Exercise caution when working on wet surfaces, as they tend to be slippery.


  • Add contents of container to a plastic bucket or plastic pump-up sprayer. Do not use a metal container.
  • For ease of application, apply Thompson's® WaterSeal® Deck Cleaner & Brightener with a pump-up sprayer, or use a synthetic bristle brush or roller.
  • Apply to no more than 5-10 boards (20 sq. ft.) at a time to maintain adequate surface wetness and allow best results. Immediately and thoroughly rinse any overspray or accidental spills with water.
  • Allow Thompson's® WaterSeal® Deck Cleaner & Brightener to remain on wood for 10-15 minutes. For best results, lightly scrub surface with a stiff, synthetic bristle brush. Do not let Thompson's® WaterSeal® Deck Cleaner & Brightener completely dry during application.
  • Thoroughly rinse the surface with a garden hose or pressure washer, removing all residue. After rinsing the surface, be sure to saturate the ground around plants and shrubs with fresh water.
  • Stubborn stains or missed areas may need to be scrubbed with additional Thompson's® WaterSeal® Deck Cleaner & Brightener and rinsed again.


  • Wait 2-3 days, depending on weather conditions, for the wood to dry thoroughly before applying a Thompson's® WaterSeal® waterproofer or stain.

Clean Up

  • Rinse equipment and brushes thoroughly with soap and water.