How to Mix Bleach to Clean a Patio Deck

Updated February 21, 2017

Bleach is a disinfectant that kills bacteria growth along with mould and mildew from all types of surfaces. Patio decks harbour moisture and dirt in the smallest of crevices and need cleaned two or three times a year to keep them looking fresh. Chlorine bleach is effective at killing germs but may be too harsh on decks. Powdered oxygen bleach is an alternative to chlorine bleach since it is environmentally friendly while still killing offending bacteria. Mixing bleach properly is the first step to cleaning your patio deck.

Fill a bucket with one gallon of warm water.

Measure 170gr of powdered oxygen bleach and place it into the bucket of warm water. The oxygen bleach will begin to bubble and foam, creating oxygen ions that work against bacteria and algae.

Mix the bleach granules in the warm water with a toilet brush or other plastic device. Stop mixing and allow the granules to dissolve for four to five minutes before applying the bleach to the deck.

Use the oxygen bleach within four to six hours of mixing. Oxygen bleach loses ions after this time, reducing its effectiveness.


Wear rubber gloves when working with bleach. If you wish to use chlorine bleach on a deck, mix one part bleach with three parts water in a bucket.


Never mix bleach with other cleaners.

Things You'll Need

  • Bucket
  • Warm water
  • Oxygen bleach
  • Toilet brush or plastic device
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About the Author

Constance Barker, located in the hills of southern Ohio, is the owner and writer of several financial, credit report and travel websites. She started writing in 1999 for private clients and began creating website content in 2004. She gained expertise in home improvement after she and her husband built their home themselves.