Use the Kitchen Classics range to serve, store, bake, or heat. The oven is safe to 220 degrees Celsius. Dishwasher, microwave, and freezer safe, however, do not take directly from freezer to oven. Remove stubborn baked-on food by soaking in warm water with mild detergent and using a nylon scourer. Stainless wool, metal utensils, and knives may scratch the glass surface.