What should I do with coals and ashes after I'm done cooking?

Never leave coals and ashes unattended — before leaving the grill, remove remaining coals and ashes from the smoker. Place them in a non-combustible metal container, saturate with water, and let them remain for 24 hours before disposing of them. Wet down the smoker area with a garden hose, then cover and store the smoker safely out of reach of children. (Page 2)