Kamado Joe Heat Deflectors suitable to fit the Classic Joe (15') allow you to cook with indirect heat and create different heat zones within your grill for cooking unlike foods at the same time. Made from easy-to-care-for ceramic, these Heat Deflectors circulate heat around your food for more even cooking. The halved design works with the Divide & Conquer Flexible Cooking System. Cleaning tip:The ceramic plate will darken over time and this is normal. Cleaning solutions should not be used, because they will be absorbed into the plate. If you have drippings that have charred, simply brush off as much as possible with a wire BBQ brush and store in a dry place. To clean off any residual food, simply flip the ceramic plate "food side down" the next time you cook. The heat from the charcoal with burn it off.