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 use in microwave. Do not use in freezer. Do not fill with boiling water. This product is not fully airtight. Do not leave on its side. Do not use or store in a place subject to direct sunlight. Immediately discontinue use if the product becomes deformed or damaged.