Some foods, like tomato-based products, curry or food seasoned with the herb turmeric, can stain containers. Before cooking, spray your container with non-stick cooking spray or oil to help reduce the risk of staining. If staining does occur, we recommend applying a paste of baking soda and water and then rinsing thoroughly, which can help reduce the stain. Stained product will still be food safe and may be used again and again.