Do not use if the product is scratched or cracked before use.Wash with dish detergent before first usage.Do not wash with dishwashers or dish dryers.Do not use a scrub brush or polishing powder with this product.Do not apply force and twist from the inside when cleaning.Use a sponge with a handle.Do not use in microwave.Do not use over an open flame or in an oven.Do not fill with boiling water.Stop using this product immediately if it becomes damaged.