The cooking grids are made of stainless steel and are coated with porcelain. Once the porcelain is cracked, the heat expands the crack and causes it to bubble. When it dries, it will begin to flake off. To clean the porcelain cooking grid, you should use a Teflon-safe scouring pad, hot water and a liquid grease fighting detergent.
For further assistance, please call our Customer Care Center at 1.800.762.1142.