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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow
Categories
Home and Garden
Yard and Outdoors
Decks
How to Clean a Deck with Bleach Download Article Co-authored by Anthony "TC" Williams
Last Updated: October 14, 2025 References
Download Article
Loosening Surface Debris
|
Removing Algae and Dirt
|
Treating Mildew and Stains
|
Tips
|
Things You'll Need
|Show more|Show less X
This article was co-authored by Anthony "TC" Williams. Anthony "TC" Williams is a Professional Landscaper in Idaho. He is the President and Founder of Aqua Conservation Landscape & Irrigation, an Idaho Registered Landscape Business Entity. With over 21 years of landscaping experience, TC has worked on projects such as the Idaho Botanical Garden in Boise, Idaho. He is a Idaho Registered Contractor and a previously Licensed Irrigator in the State of Texas. There are 7 references cited in this article, which can be found at the bottom of the page. This article has been viewed 91,291 times.
Decks are a great addition to any house and enable a homeowner to enjoy and experience nature more often. Unfortunately, decks are often susceptible to dirt and algae because they're outside. Contrary to popular belief, chlorine bleach is not a great cleaner for a wood deck. Luckily, you can use powdered oxygen bleach to scrub down and clean your deck without damaging the deck's wood or any surrounding plantlife.
Steps
Part 1 Part 1 of 3:
Loosening Surface Debris
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1 Move all the furniture off of the deck. Furniture will get in the way as you clean. Remove all planters, seats, and tables from your deck before you start to clean it.[1]XResearch source
2 Sweep down your deck with a broom. Use a dry brush or broom to get the initial dirt and dust off of the deck. If you do this before you get the deck wet, it will be easier to remove grime and algae later. Work in large sweeping motions and go up and down your deck until it's free of debris and dust.[2]XResearch source
You can remove debris like sticks, leaves, and seeds with a leaf blower. Additionally, you could use a shop vacuum to get in between crevices.
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3 Spray down your deck with a hose to loosen dirt. Use a garden hose and spray in a uniform motion across the deck. If you have a pressurized attachment, you'll want to make sure that the pressure is not too high and not too low. Adjust the nozzle so that the hose creates a fan of water and not a single stream. If you don't have an adjustable nozzle, you can fit your thumb over half of the opening on the end of the hose to create a similar effect.[3]XResearch source
If the pressure is too high on your hose, it can create discoloration on the surface of your deck.
Advertisement Part 2 Part 2 of 3:
Removing Algae and Dirt
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1 Mix warm water and powdered oxygen bleach into a bucket. Pour 2 gallons (3.78 l) of warm water in a 5-gallon (18.92 l) bucket. Add 2 cups (400 g) of powdered oxygen bleach and mix the solution together using the sponge or brush that you'll be using to scrub down your deck. Continue to mix the solution until the components are well incorporated.[4]XResearch source
Remember to wear water-proof gloves, boots, and possibly rain pants when working with bleach.
Mix the solution outside or in a well-ventilated area.
2 Scrub down your deck with a synthetic brush or sponge. If you don't have a deck brush, you can use a large porous sponge to scrub down the surface of your deck instead. Liberally saturate the surface of the deck with the solution, then start scrubbing the deck until the solution starts to lather.[5]XResearch source
Synthetic deck brushes can be purchased at most hardware stores and are designed specifically to wash a deck.
Be careful when walking on your deck because the bleach solution will make it slippery.
3 Let the suds sit on the deck for 5 minutes. Letting the suds sit on the deck will allow the oxygen bleach to absorb the dirt and algae on your deck. It's important that you don't let the solution thoroughly dry on the deck, or it can leave a film on the surface.
4 Rinse down your deck. Use the hose to do a final rinse down of your deck. If you don't have a hose, you can get buckets of water from an indoor faucet and use that to rinse down the deck. Make sure that all of the bleach solution is rinsed away before letting your deck air dry.
Advertisement Part 3 Part 3 of 3:
Treating Mildew and Stains
Download Article
1 Create an oxygen bleach paste to spot clean your deck. If you don't need to do a full cleaning of your deck, but you see an excess buildup of algae or dirt, you can make a more concentrated paste with your bleach. Simply add a little water to some oxygen bleach powder and mix the solution together with a spoon until it forms a thick paste. Apply the paste to the dirty areas of your deck with a nylon brush and let it sit for 15 minutes before thoroughly rinsing it off.[6]XResearch source
2 Add borax to your deck cleaning mixture to remove mildew. Pour one cup (200 g) of borax into the bucket with your bleach and water solution. Mix it together while wearing gloves and target specific areas on your deck where mildew has formed.[7]XResearch source
Borax can typically be found in the laundry detergent aisle of the grocery store and is a mineral compound that won't destroy your nearby plants.[8]XResearch source
3 Don't use power washers or chlorine bleach to wash your deck. Power washers can sometimes be too powerful and could damage the wood forever. Instead of using a power washer, use a pressurized adjustment on your hose or a lighter pressure spray machine.[9]XResearch source Never use chlorine bleach to wash your deck. Chlorine bleach is toxic to plant life, can discolor your wood, and reduces the integrity of the wood.
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Tips
A proper application of a sealer will help keep the deck clean and in better condition. Thanks Helpful 0 Not Helpful 0
Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement
Things You'll Need
Dry brush
Garden hose
Synthetic wet brush or sponge
Oxygen Bleach
Water
Borax (optional)
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Co-authored by: Anthony "TC" Williams Professional Landscaper This article was co-authored by Anthony "TC" Williams. Anthony "TC" Williams is a Professional Landscaper in Idaho. He is the President and Founder of Aqua Conservation Landscape & Irrigation, an Idaho Registered Landscape Business Entity. With over 21 years of landscaping experience, TC has worked on projects such as the Idaho Botanical Garden in Boise, Idaho. He is a Idaho Registered Contractor and a previously Licensed Irrigator in the State of Texas. This article has been viewed 91,291 times. 13 votes - 85% Co-authors: 9Updated: October 14, 2025 Views: 91,291 Categories: DecksArticle SummaryX
To clean a deck with bleach, start by spraying the deck with a hose to loosen any caked-on dirt or debris. Then, working outside or in a well-ventilated area, mix 2 gallons of water and 2 cups of powdered oxygen bleach in a bucket. Once you've prepared the bleach solution, scrub the deck with it using a brush or sponge and let it sit for 5 minutes. Finally, rinse off the deck with a hose to remove all of the bleach residue. To learn how to remove mildew and stains on a deck using bleach, scroll down!Did this summary help you?YesNo
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Iris Cox
Jun 29, 2018
"It warned about chlorine bleach. Very clear directions, thanks."
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Anthony "TC" Williams Professional Landscaper Co-authors: 9Updated: October 14, 2025 Views: 91,29185% of readers found this article helpful. 13 votes - 85% Click a star to add your vote
Iris Cox
Jun 29, 2018
"It warned about chlorine bleach. Very clear directions, thanks." Share yours!
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How toClean a Dishwasher with Bleach 
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Co-authored by: Anthony "TC" Williams Professional Landscaper This article was co-authored by Anthony "TC" Williams. Anthony "TC" Williams is a Professional Landscaper in Idaho. He is the President and Founder of Aqua Conservation Landscape & Irrigation, an Idaho Registered Landscape Business Entity. With over 21 years of landscaping experience, TC has worked on projects such as the Idaho Botanical Garden in Boise, Idaho. He is a Idaho Registered Contractor and a previously Licensed Irrigator in the State of Texas. This article has been viewed 91,291 times. 13 votes - 85% Co-authors: 9 Updated: October 14, 2025 Views: 91,291 Categories: Decks Article SummaryX
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1 Move all the furniture off of the deck. Furniture will get in the way as you clean. Remove all planters, seats, and tables from your deck before you start to clean it.[1] 
2 Sweep down your deck with a broom. Use a dry brush or broom to get the initial dirt and dust off of the deck. If you do this before you get the deck wet, it will be easier to remove grime and algae later. Work in large sweeping motions and go up and down your deck until it's free of debris and dust.[2] 
3 Spray down your deck with a hose to loosen dirt. Use a garden hose and spray in a uniform motion across the deck. If you have a pressurized attachment, you'll want to make sure that the pressure is not too high and not too low. Adjust the nozzle so that the hose creates a fan of water and not a single stream. If you don't have an adjustable nozzle, you can fit your thumb over half of the opening on the end of the hose to create a similar effect.[3] 
1 Mix warm water and powdered oxygen bleach into a bucket. Pour 2 gallons (3.78 l) of warm water in a 5-gallon (18.92 l) bucket. Add 2 cups (400 g) of powdered oxygen bleach and mix the solution together using the sponge or brush that you'll be using to scrub down your deck. Continue to mix the solution until the components are well incorporated.[4] 
2 Scrub down your deck with a synthetic brush or sponge. If you don't have a deck brush, you can use a large porous sponge to scrub down the surface of your deck instead. Liberally saturate the surface of the deck with the solution, then start scrubbing the deck until the solution starts to lather.[5] 
3 Let the suds sit on the deck for 5 minutes. Letting the suds sit on the deck will allow the oxygen bleach to absorb the dirt and algae on your deck. It's important that you don't let the solution thoroughly dry on the deck, or it can leave a film on the surface. 
4 Rinse down your deck. Use the hose to do a final rinse down of your deck. If you don't have a hose, you can get buckets of water from an indoor faucet and use that to rinse down the deck. Make sure that all of the bleach solution is rinsed away before letting your deck air dry. Advertisement 
1 Create an oxygen bleach paste to spot clean your deck. If you don't need to do a full cleaning of your deck, but you see an excess buildup of algae or dirt, you can make a more concentrated paste with your bleach. Simply add a little water to some oxygen bleach powder and mix the solution together with a spoon until it forms a thick paste. Apply the paste to the dirty areas of your deck with a nylon brush and let it sit for 15 minutes before thoroughly rinsing it off.[6] 
2 Add borax to your deck cleaning mixture to remove mildew. Pour one cup (200 g) of borax into the bucket with your bleach and water solution. Mix it together while wearing gloves and target specific areas on your deck where mildew has formed.[7] 
3 Don't use power washers or chlorine bleach to wash your deck. Power washers can sometimes be too powerful and could damage the wood forever. Instead of using a power washer, use a pressurized adjustment on your hose or a lighter pressure spray machine.[9] Never use chlorine bleach to wash your deck. Chlorine bleach is toxic to plant life, can discolor your wood, and reduces the integrity of the wood. Advertisement 
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