Thompson's® WaterSeal® Deck Wash

Deck Wash

This easy-to-use deck wash gets rid of the dirty, gray and weathered look of your deck. Just spray on the deck wash, rinse off with a hose and in minutes you’ll see the weathered look disappear.

Key Features

  • Makes Weathered Wood Look New
  • Removes Stains from Dirt, Mildew, Algae and Fungus
  • Ready to Use
  • Use Before Waterproofing: Decks, Fences, Outdoor Furniture, Exterior Wood and Wood Plastic Composite Decking

Approximate Coverage

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

Before You Begin

  • This product contains bleach. Handle with care.
  • A trial patch is recommended before starting. If the surface has been previously treated with a waterproofer, splash the surface with a glass of water. If it beads, dampen the wood slightly before using Thompson's® WaterSeal® Deck Wash.
  • Remove all deck furniture and decorative items. 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 protective gloves and old clothing. Do not allow product to come into contact with clothing, carpet or fabric, as discoloration can occur. When spraying, use eye protection.
  • The longer Thompson's® WaterSeal® Deck Wash is allowed to work, the lighter the wood will become. Do not allow the product to remain on the surface for more than 30 minutes, as an uneven appearance may result.
  • Thompson's® WaterSeal® Deck Wash may slightly darken redwood or cedar. To brighten wood after cleaning with this product, use Thompson's® WaterSeal® Deck Cleaner & Brightener.
  • Plan the application: for horizontal surfaces, work backwards so that you do not walk on the surface being treated. For vertical surfaces, work from the bottom up.
  • Exercise caution when working on wet surfaces.
  • Thompson’s® WaterSeal® Deck Wash can also be used on exterior painted surfaces to remove stains from mildew if diluted 50/50 with water.


  • Add contents of container to a plastic bucket or plastic pump-up sprayer. Do not use a metal container.
  • Apply Thompson's® WaterSeal® Deck Wash liberally with a brush, roller or sprayer. If you are using a pump-up sprayer, use a coarse spray.
  • In areas with heavy discoloration or dirt, apply a second coat and brush lightly with a broom.
  • Immediately and thoroughly rinse any overspray or accidental spills with water, especially on metal to avoid pitting or discoloration.
  • Wait 5-10 minutes and then thoroughly rinse the surface with a garden hose, removing all residue.
  • After rinsing the surface, be sure to saturate the ground around plants and shrubs with fresh water.

Clean Up

  • Rinse equipment and brushes thoroughly with water.


CAUTIONS: CONTAINS SODIUM HYPOCHLORITE. Causes burns to eyes and mucous membranes. Avoid breathing spray mist. Use only with adequate ventilation. If you experience eye watering, headaches, or dizziness, increase fresh air, or wear respiratory protection (NIOSH approved) or leave the area. Prevent contact with eyes, skin and clothing. Wear impervious chemical-resistant rubber gloves and safety goggles during use. Wash hands after using. Keep container closed when not in use. Do not transfer contents to other containers for storage. Do not mix with other chemicals. FIRST AID: In case of eye contact, immediately flush eyes with large amounts of water for 15 minutes and get medical attention. For skin contact, wash thoroughly with soap and water. If irritation persists, get medical attention. 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. WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. DO NOT TAKE INTERNALLY. KEEP OUT OF THE REACH OF CHILDREN.

Also Available