The pressure needed for pressure washing your deck will be around 1500 PSI and the best tip for the job is a wide-angle tip of 25 to 40 degrees to create a wider spray to protect the wood from damage.
Do not use a hot water pressure washer on your deck. Remove any lose articles that may become projectiles when pushed by the pressure washer jet. Practice making a pendular motion with the spray up, down, and up again away from the surface. With this motion you will avoid leaving marks on the deck were the cleaning stroke starts.
Test the pressure washer on some old boards or a hidden side of the deck to make sure that the pressure is adjusted correctly and the spray will not cause any damage to wood. Wear protective eyewear and gloves.
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Need a little more scrubbing power? Want to increase your cleaning efficiency?
Ultimate Washer offers a variety of Rotary Nozzles from which you can choose. Your cleaning time can be cut in half with the addition of this nozzle. These nozzles rotate at high speeds to increase the intensity of the spray. They can remove rust, graffiti, and barnacles from the bottom of boats just to mention a few. They can be used on pressure washers with as little as 3000 PSI up to the super heavy duty pressure washers whose PSI reaches 5000 PSI. Find more info at http://www.ultimatewasher.com/pressure-washer-rotary-nozzles.htm