[header] How to clean a composite deck [title] Sweep away debris at least once per week. [step] Keep your deck clear of dirt and debris with frequent sweeping. Depending on how much traffic your deck gets and what the current season is, you may want to sweep once a day, or every few days. 
At minimum, sweep it once per week. [substeps] If you have a very large deck, a leaf blower may be ideal.