Defy Exterior Wood Brightener

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Defy Exterior Wood Brightener is an oxalic acid deck brightener for wood deck cleaning that removes dirt, grime, tannin, rust, and fungi stains from wood surfaces. Find out how to clean your wood deck for the best results to restore the wood's natural beauty. Defy Wood Brightener is a liquid concentrate that is mixed 5:1 with water to brighten and restore the natural beauty of exterior wood.


  • Restores the rich look of new wood
  • Won't harm most plants or shrubbery
  • Removes tannin and rust stains
  • Biodegradable
  • Neutralizes strippers
  • Helps stains penetrate

Defy Wood Brightener removes tannin and rust stains and is recommended for use on all species of wood, including redwood. Defy Wood Brightener will not harm wood fibers, grass or most plants when used properly.

Defy Wood Brightener is recommended for surface preparation prior to the initial application of clear finishes and stains. It is used as a neutralizer and brightener for all wood species that have been cleaned with Defy Wood Cleaner. For best results, use Defy water repellent wood finishes.

How to clean your wood deck with an oxalic acid deck brightener
Even new wood needs cleaning to remove mill scale, making the surface more porous to easily absorb deck stains. Defy Wood Brightener is the 2nd step in a 3 step system to maintain your deck and keep it looking like new. The 3 steps are:

  1. Brighten using Defy Wood Brightener
  2. Apply Defy water repellent wood stains

Product Data Sheet

Defy Wood Brightener is a liquid concentrate sold in 1 gallon containers. 1 gallon of Defy oxalic acid deck brightener makes 5 gallons of solution and will clean approximately 500-1,000 total square feet (or 100-200 square feet per gallon). Defy Wood Brightener is not formulated to remove intact paint, stain, or clear finishes and may dull painted and metal surfaces if not quickly rinsed.

14ptWARNING: This product can expose you to Ethylene oxide, which is known to the State of California to cause birth defects or other reproductive harm, and Cumene, which is known to the State of California to cause cancer. For more information, go to

Sizes: Gallons Only
Concetrate: Makes 5 Gallons
Coverage Per Gallon: 100-150 sq. feet
Temperature: 45-95 F
Application Tools: Sprayer, Mop
More Info: Product Data


Defy Stain Tips and

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Thursday, 19 October 2017

Excellent wood brightener for prep and to neutralize a deck cleaner/stain stripper.


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  • We will reply to your comment shortly.
    Ben Hoppe · 08/07/2011
    I have a new cedar deck. Approximately 460 sq feet plus rails. I would like to maintain the natural color for as long as possible. I was thinking the extreme stain with cedar tint. Would this be my best option? Would 5 gallons be enough. Would I need 2 coats on the horizontal areas?
  • We will reply to your comment shortly.
    opwdecks · 07/12/2011
    No. Defy stains are semi-transparent.
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    Shannon G · 07/12/2011
    Do you have what is commonly referred to as SOLID COLOR LATEX STAIN for decks? I am trying to match a McCloskey stain that is on my back deck.