Cleaning Porcelain coated cast iron gas grill

Opetion #1

Individually wrap the grates in several layers of newspaper. WORKING OUTDOORS, soak the newspaper in household ammonia (water) with or without soap. Immediately slip the wrapped soaked grills in a single heavy-duty plastic garbage bag, fold over the end, and leave outdoors, overnight. BE CERTAIN TO STAY UPWIND FROM THE AMMONIA! (You are probably better off doing this on a concrete or masonry surface, and NOT grass!)

The next day, remove the grates and hose them off. Then scrub them (use a bristle brush) with soap (or liquid dish detergent) and water. Hose them off again.

This will (supposedly) clean them!

Option #2.

If your oven is "self-cleaning", put the grates in it, and start the cleaning cycle.

Option #3.

Again, OUTDOORS, set the grates on a large flattened plastic bag, and spray with Easy Off oven cleaner. WARNING: this is a highly corrosive sodium hydroxide spray -- use rubber gloves and eye protection! Again, stay upwind! After the package recommended time, hose off, and scrub, using clean wash water.