The high pressure stream of water from a pressure washer loosens dirt and grime, and it can also spray that dirt and grime back onto your yard, and you! If you have delicate flowers or shrubs growing near the base of your fence, covering them with a tarp for protection is a good idea. Start with a green-tipped, 25-degree nozzle. This nozzle is the best for all purpose pressure washing, but if you encounter tough grime or heavily stained areas of the fence, you may need to switch to a yellow-tipped, 15-degree nozzle. High pressure water can do significant damage at close range, so begin farther away from the fence, try about two feet, and then gradually move forward if necessary.

It may take you a couple of passes to find the right distance for cleaning, but it’s better to move slowly than to gouge the wood. Most residential pressure washers, especially those available for rent, only offer cold water settings. If, however, you’ve managed to snag a heavier duty machine, you may have both cold and hot water options. For pressure washing a wood fence, stick to cold water. Hot water can raise the grain of the wood and make staining or sealing the fence more difficult. Protect your eyes with safety glasses, and never direct the water stream toward people, pets, or electricity sources.

You may also consider wearing ear protection. Pressure washers can be loud, and protecting your hearing is important. And remember: you will get wet, so dress accordingly!