Keeping the grill rack clean is your first line of defense for healthy grilling. Each time you grill, preheat the rack with all burners on high for 10 to 15 minutes to incinerate any remaining residue from the last cookout, making it easy to clean off. Then brush the grates with a grill brush, and clean the grates vigorously so they’re smooth and free from food. We recommend brass-bristle grill brushes rather than steel bristles, which can damage the enamel finish of some grates. In a pinch, use a ball of heavy-duty aluminum foil between a pair of tongs in place of a brush.