[header] How to clean a gas grill [title] Turn off the gas supply to the grill. [step] You do not want to have dangerous gasses build up during the cleaning process that can lead to injury. [substeps] Locate the gas supply valve on the propane tank for lp grills and where the grill connects to the house for lng supplied grills. 
Turn the knob or lever clockwise to shut off the gas supply running into the grill. Remember " righty-tighty, lefty-loosey " to close and open valves.