①Unless special materials are used for protection, in principle, the thermos can only be filled with water. It is not suitable for long-term storage of acidic foods, such as juice, lemonade, carbonated drinks, etc., because it is easy to remove heavy metals; it is also not suitable for making tea or carrying Chinese medicine, hot milk. (Except directly indicated on the bottle can be used)

②When cleaning the vacuum flask, do not use steel wire to scrub the surface of the inner tank. For difficult to remove stains, you can rinse with neutral detergent, or rinse with diluted vinegar (the washing time should not be too long to avoid damage to passivation Film), and professional cleaning agents.