There are so many steps to cleaning a grill that we broke the process down into these 10 mini-steps.
Check for leaks. Put soapy water on hoses, tubes, the regulator and the valves. Turn on the propane tank and look for growing bubbles. Try tightening the connections. If the bubbles still stick around, you've got a gas leak. Replace anything bent or damaged. Then clean and reconnect the hoses and tubes.
Scrub it down with warm soapy water. Be sure to avoid oven cleaner, as it's corrosive and can damage different parts of the grill.
Disconnect the gas. If the gas jets are not removable, put tape over them to prevent blockage.
Take off the grates and clean them separately with a soft wire brush. Later, use the brush to remove debris from the body and lid.
Dump used briquettes, ash and grease. Clean the grease cup and replace it if needed.
Wipe down the burners, making sure nothing is rusted. Replace any worn-out burners or burner tubes.
Check the ignition pieces. If you need to, scrape off grease and residue with sandpaper.
Make sure the burners' wires are not chewed through. This is a sign of rodents making their home under the burners.
Also scrub grease stains off the exterior. If the outside of your grill is stainless steel, use a cleaner made for that material.
Do the tighten-up. Check the bottom of the grill to see if any squeaky wheels or hinges need lubrication (Check out this article for tips on cleaning all of your outdoor gadgets!). Fix the issues, tightening any loose screws or bolts.
Step 2: Rust-Proof It All