When giving your grill a good cleaning first always disconnect the propane tank and make sure the grill is not hot. Next remove the grates and soak them in warm soapy water. We recommended dawn dish soap because it works great for this since it breaks down grease. You want to scrub the grates with a good hard brush after they have soaked for a while. Next you will want to scrub under the hood of your grill you can use clean vinegar in a spray bottle and a good brush. If you can you may want to scrub the burners with a dry brush to help make sure the burner holes are not clogged. Some grills you may not have burners or may not be able to get to them. Last make sure to empty and clean the grease trap. Reassemble the grill and cover with a grill cover for next use.
