What can't be soaked in a stainless steel insulated cup?

What can't be soaked in a stainless steel insulated cup?
What can't be soaked in a stainless steel insulated cup? Before using a thermos cup, everyone should carefully read the product instructions. After each use, the insulated cup should be cleaned and dried in a timely manner to prevent the growth of bacteria and the generation of odors.
1. Can a thermos make tea? Using a stainless steel insulated cup to brew tea will not cause metal migration or cause corrosion to the stainless steel material. However, we still do not recommend using insulated cups to brew tea because tea leaves are usually suitable for brewing, as prolonged soaking in hot water may damage the vitamins and affect the flavor and taste. At the same time, if the tea is not cleaned in a timely and thorough manner after brewing, tea stains will adhere to the inner liner of the insulation cup, producing a strange smell.
2. Can I hold milk and soybean milk in a thermos cup? High protein drinks are prone to spoilage after prolonged insulation, and can cause symptoms such as diarrhea after consumption. In addition, the protein in the beverage can easily adhere to the cup wall, making cleaning difficult. If you are using a temporary insulated cup to hold such drinks, you should first disinfect the insulated cup with hot water, drink it as soon as possible, and clean it as soon as possible.
3. Can a thermos cup hold carbonated drinks, fruit juice, or traditional Chinese medicine? When the chromium content in stainless steel reaches a certain value, a dense passivation film will be formed on the metal surface, blocking the infiltration of oxygen atoms, thereby playing a role in corrosion resistance. Carbonated beverages, fruit juices, and traditional Chinese medicine are mostly acidic and will not cause heavy metal migration when placed in a thermos for a short period of time. However, these liquids have complex components and some have strong acidity, which may cause corrosion to stainless steel after prolonged contact.
Try to use a soft sponge or cotton cloth for cleaning and avoid using a hard brush or steel wire ball to avoid scratching the stainless steel surface inside the insulation cup.