Wash with dish detergent before first usage. Do not use a scrub brush or polishing powder with this product. Do not wash with dishwashers or dish dryers. Do not use in freezer. This product is not fully airtight. Immediately discontinue use if the product becomes deformed or damaged. Keep away from fire and other sources of heat. Read your microwaves instruction manual before use. Do not use for cooking food in the microwave can be used for reheating only.　 Do not heat while empty.