However, the porcelain glaze can chip and rust if not properly cared for. Use a soft brass brush to clean. To prevent sticking on any grid, apply a light coat of cooking oil to the grid. Remove residue with a wire grill brush. When juices drip from food onto hot charcoal, it produces flavor because the resulting steam rises to season the food.
Gas grills use several materials to produce the same effect.
Lava rock heats quickly and disperses the heat to the interior of the grill. Lava is porous and allows grease to accumulate, lessening its efficiency and increasing flare-ups. Replace lava rock yearly or turn over to expose a fresh surface. Pumice stone operates like lava but collects less residue. Ceramic is more expensive than rock but lasts much longer.