Please choose the correct ending to complete the given sentence: Home and Garden: [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.

Ending1: Quickly close the valve so the valve is open. Turn on the gas supply valve and remove the cooking oil from the engine to a safe place to put it in your grill. Ending2: On lp grills, the primary fuel source is lp. Change the fuel source by removing the d valve located at the bottom of the tank and turning it counterclockwise, which should turn it off. Ending3: [title] Wait two to three days for the grill to reach temperature and the fillers. [step] You can light and grill the grill during a small amount of time. Ending4: 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.

Answer format: ending1/ending2/ending3/ending4