Thompson's® WaterSeal® Deck Cleaner & Brightener

Deck Cleaner & Brightener

Cleans all wood types but is specially formulated for redwood, cedar, mahogany and other highly extractive woods. While many cleaners can darken these woods, this deck cleaner actually helps restore their natural color and beauty. Deck Cleaner & Brightener also acts as a neutralizing agent after using some cleaners.

Key Features

  • Restores Wood's Natural Color and Beauty
  • Removes Tannin Bleed/Stains and Rust
  • Removes Mill Glaze on New Wood
  • Removes Stains from Dirt, Mildew, Algae and Fungus
    Ready to Use
  • Use Before Waterproofing: Decks, Fences, Outdoor Furniture and Other Exterior Wood Surfaces
  • Use on redwood, cedar, highly extractive wood, if you need to remove tannin staining and restore lighter color of redwood/cedar/mahogany or other highly extractive wood species in addition to removing stains from dirt, mildew, algae and fungus and/or as instructed, to neutralize any wood species after using other cleaners.

Approximate Coverage

  • 150-250 Sq. Ft/Gal.
Coverage depends on the condition and porosity of the wood.

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.


CAUTIONS: Contains Oxalic Acid. Do not allow contact with eyes and skin. Wear safety glasses and rubber gloves when handling and during application. If material contacts skin, immediately wash with soap and water. Use only with adequate ventilation. To avoid overexposure, ensure fresh air entry during handling and application. Avoid breathing mist. If you experience eye watering, headaches, or dizziness, increase fresh air, or wear respiratory protection (NIOSH approved) or leave the area. Keep container closed when not in use. Do not transfer contents to other containers for storage. FIRST AID: In case of eye contact, immediately flush eyes with water for at least 15 minutes. Get medical attention. For skin contact, wash thoroughly with soap and water. In case of respiratory difficulty, provide fresh air and call physician. If swallowed, do not induce vomiting. Call Poison Control Center, hospital emergency room, or physician immediately. DO NOT TAKE INTERNALLY. KEEP OUT OF THE REACH OF CHILDREN.

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