- 1). Hold the power washer 18 inches away from the deck while spraying evenly. Give the decking a thorough initial wash to remove surface dirt, debris and algae.
- 2). Mix an oxygen bleach or bleach-type deck cleaner in a garden sprayer. Follow the provided directions on the cleaner for specific mixing instructions.
- 3). Apply the bleach cleaner evenly to the deck with the garden sprayer. Let the cleaner sit for 10 minutes after application.
- 4). Rinse the decking with the power washer, keeping it 18 inches away from the wood and spraying evenly. Hold the power washer wand 4 to 6 inches away from board gaps, and spray in between the gaps to remove algae between deck boards.
- 5). Rinse the deck up to three times to adequately remove all algae.
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