Wash with dish detergent before first usage.Do not apply force and twist from the inside when cleaning.Use a sponge with a handle.Do not use a scrub brush or polishing powder with this product.Do not wash with dishwashers or dish dryers.Do not use in microwave.Do not use in freezer.Do not fill with boiling water.Stop using this product immediately if it becomes damaged.Keep away from fire and other sources of heat.