Firstly it is important to get a pressure washer with a fan tip. Pressure washers work great for cleaning wood decks because they can clean wood effectively and relatively quickly. Be sure you use a pressure washer with a fan tip to prevent the washer from spraying too harshly upon the wood surface.

Next use a cleaning solution. There are a variety of quality wood or a deck cleaners that remove grime, dirt and even moss build up. Read the instructions on your product label. Most products typically require you to mix one part cleaner with one part water. Once mixed pour the cleaning solution into the pressure washer's soap dispenser.