A dirty grill may produce smoke that will alter the taste of your food. Follow these steps on an annual basis to ensure that doesn’t happen. Clean the grates with a wire brush every time you grill (when grates are hot) to make yearly cleaning easier. Always check manufacturer's instructions before beginning any cleaning.
Step 1: Disconnect the gas line. Fill a bucket with warm soapy water.
Step 2: Remove the grates, then brush them clean using a wire brush. (For a charcoal grill, brush out the insides, then jump to Step 4.)
Step 3: Remove the barrier separating the grate and burners — this is usually a flame shield, briquettes or lava rocks. Unclog the burner holes using a soft wire brush. Brush away any ash or residue, then set the burner back into place. Wash the flame shield in warm soapy water, or brush the briquettes or lava rocks clean.
Step 4: Use a stiff wire brush and soapy water to scrub the inside surfaces of the grill. Rinse with clean water and dry with a cloth.
Step 5: Heat the grill for at least 10 minutes before grilling.