①Unless special materials are used for protection, in principle, the thermos cup can only be filled with water. It is not suitable to store acidic foods for a long time, 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 thermos cup, 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 wash with diluted vinegar (washing time should not be too long to avoid damage to passivation Membrane), and professional cleaning agents.