Great for lunches and mornings. (Handling Instructions) The urethane finish is covered with resin. Therefore, it is resistant to water stains, so it can be used for commercial use. Uses urethane that meets food safety standards, so it can be used safely even by children. Wipe clean with soft cloth for maintenance. You can also use a neutral detergent, but please wash it gently with a soft sponge as possible. After use, wipe it as soon as possible and dry thoroughly. Avoid direct sunlight. Please do not use in the microwave, dishwasher, or dish dryer.