We recommend regular cleaning of the steam tank to prevent damage to The Meal Maker from mineral deposit build-up. Always unplug before cleaning. Put 1/3 cup white vinegar and 1/3 cup distilled water in The Meal Maker water tank and let sit overnight. Pour out vinegar and water solution. Refill steam tank with purified water, plug in The Meal Maker and run the “steam” cycle for 15 min. Rinse with purified water to eliminate any remaining vinegar taste. Empty any remaining water and refill with purified water before steaming new meals.