① Unless 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)

 

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