You can make tea and coffee, which is not very harmful to your health, but if you scrub it clean after each use, the corrosion to the cup will be much smaller, and it will not affect the insulation of the thermos cup. The insulation of the cup mainly depends on the vacuum layer between the inner layer and the outer layer, which has nothing to do with what you put. ?

Usage of 304 stainless steel thermos cup:

Clean the interior before use, keep the interior warm with hot water, and keep the heat preservation effect after use.

When in use, put the water 2 cm below the mouth of the cup and cover it-disinfect it with warm soda. Drop 1-2 drops of warm vinegar water, soak for 30 minutes, and then wipe with a soft sponge to keep it clean. Due to the temperature difference between inside and outside air, water droplets may be generated on the cover, which is not a product quality problem. Erythema may be caused by water stains. Warm water with 10% vinegar can be dripped into the cup for 30 minutes, and then wiped clean with a soft cloth.

Wash with warm water after use, dry the water stains with sponge or cloth, and put them in a cool and ventilated place.