Care: Wash before first use. Disassemble before cleaning. Wash with hot water and mild detergent, then rinse clean. Dishwasher-safe (top rack only). Allow to dry before storage. To avoid damage, do not use a nipple brush or similar object to clean the valve. Note: The patented SureFlo valve technology used on this cup is leak proof. If cup is held upside down, a few drops may come from the spout immediately after use. Not intended for use with pulpy juice, carbonated beverages, or hot liquids.