How to Remove Stains From Deck Boards

Written by constance barker
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How to Remove Stains From Deck Boards
Keep your deck stain free with simple cleaning tips. (deck image by Albert Lozano from

Stains are bound to occur on deck boards, from grease splatter from the grill to foods and drinks being spilt while eating outside. Decks, if they are not sealed, absorb water or any substance that is poured on them, so stains are harder to remove than in sealed decks. An oxygen bleach is not as hard on wood as chlorine bleach and oxalic acid crystals can fade a stain. These products are found at most home and garden stores.

Skill level:

Things you need

  • Rubber gloves
  • Dust mask
  • Safety goggles
  • Garden hose
  • Bucket
  • Oxygen bleach
  • Oxalic acid crystals
  • Rag

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    Cleaning Stains With A Bleach Solution

  1. 1

    Put on rubber gloves, dust mask and safety goggles.

  2. 2

    Mix 1 cup of oxygen bleach with 1 gallon of water in a bucket.

  3. 3

    Scrub the stains with a scrub brush and the bleach solution.

  4. 4

    Rinse off the area with a garden hose.

    Cleaning Stains With Oxalic Acid Crystals

  1. 1

    Put on the rubber gloves, mask and safety goggles.

  2. 2

    Mix 113gr of oxalic acid crystals and 1 gallon of water in a bucket.

  3. 3

    Apply the solution with a rag to any stains on the deck boards and allow to sit for 20 minutes. This gives the crystals time to lighten the stain in the wood.

  4. 4

    Rinse the solution off with the garden hose. Allow to air dry.

Tips and warnings

  • You may use a pressure washer to clean your deck boards, but take caution as a high intensity of water can damage and splinter wood fibres.
  • Always use protective eyewear and rubber gloves along with a painter's or dust mask to avoid touching or breathing any toxic fumes from the bleach or acid.
  • You can clean your entire deck with these methods, not only the stains.

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