You can wipe it with cotton cloth dipped in alcohol. Alcohol can decompose fingerprints, scratches and the like, which is quite effective.
A thermos cup is generally a water container and a vacuum layer made of ceramics or stainless steel. The top of the thermos cup is covered and sealed tightly. Vacuum insulation layer can delay the heat dissipation of water and other liquids in it, thus achieving the purpose of insulation. The thermos cup is developed from the thermos bottle, and the heat preservation principle is the same as that of the thermos bottle, except that people make the bottle into a cup for convenience. Fingerprint is a line formed by the concave and convex skin on a person's fingertip.