How to Remove Mildew Stains on a Deck

How to Remove Mildew Stains on a Deck thumbnail
Keep mildew stains off your deck with natural products.

Your deck is a place that you want to be able to enjoy. Mildew and algae stains often appear after the winter or after a rainy season and detract from your enjoyment of the deck. Cleaning the mildew stains takes a bit of effort, but it will be worth it to be able to sit on your deck without seeing the ugly stains that can damage your deck. Does this Spark an idea?

Things You'll Need

  • Large bucket
  • 1 gallon white vinegar
  • 1 cup baking soda
  • Push broom
  • Hose
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Instructions

    • 1

      Mix vinegar and baking soda together in a large bucket. This will create a foaming mixture that will remove mildew and algae stains and kill mold, mildew and algae that may be living in the nooks and crannies of your deck. Whether you have a wood, composite or concrete decking, this mixture will remove mildew and many other stains.

    • 2

      Pour a small amount of the mixture on the deck and use a push broom to scrub it around. Treat and clean a 3-foot square area at a time until you get the whole deck treated.

    • 3

      Allow the mixture to sit on the deck for about 30 minutes before going over it again with the remaining mixture in the bucket and the push broom. This will help make sure that any mold and mildew spores are killed and that the entire surface of the deck is scrubbed clean.

    • 4

      Use a hose to rinse the deck with water to remove the whitish film that the baking soda may have left.

Tips & Warnings

  • Clean mildew stains from the deck on a warm, sunny day so it can dry thoroughly.

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References

  • Photo Credit Ryan McVay/Photodisc/Getty Images

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