This product is dishwasher safe. Do not place the product in a heated oven. Do not bring the cup parts in contact with or place on surfaces with abrasive or antibacterial cleaning agents. Cups are suitable for all common sterilization methods. For safety and hygiene reasons, replace straws after 3 months of use. Use only Philips Avent straws. For hygiene and maintenance, disassemble the straw cup completely (Fig. 1A) and store it in a dry and covered container. Keep the straw cup away from heat sources and direct sunlight. Do not store the straw cup in drying/sterilizing cabinets with heating elements.