All decks require routine cleaning.  Dirt, debris from trees, foot traffic, mold and mildew will collect on your deck over time.  Decks.com recommends cleaning your deck every Spring or as necessary to keep your deck looking attractive.  It is an easy and inexpensive project that only takes an hour or two for most decks. 

Decks.com recommends using a deck cleaner from Home Depot.  Look for an oxygen based cleaner that is safe for the environment, pets and people.  Its active ingredient is sodium percarbonate.

Simply dissolve the granular formula into water and apply across your deck with a mop, handled brush, or sprayer.  Wait 10 minutes and wash away the cleaner with a pressure washer or a garden hose.