1. After buying the porcelain cup, soak it in cold water for 1-2 hours (commonly known as annealing), then add salt to boil, cool it, take it out and wash it.

2. Cleaning stainless steel, ceramics and glass cups

(1) Liquor. Blanch thoroughly with hot 61-degree white wine, and then brew strong tea; Put it in a microwave oven, let it cool naturally after 411 watts for 11 minutes, and pour it out in 24 hours; The smell of the cup disappears completely, and it can be cleaned very clean.

(2) Soaked tea. Using soaked tea leaves to wipe, the effect is equally significant.

(3) vinegar. Put the cup in a cold water pot and add some vinegar, preferably brewing vinegar, and cook it on fire. If the water doesn't pass through the cup, just add one or two to two vinegar, and cook for twenty minutes after boiling. Be sure to put the pot in cold water. After cooking, it can not only remove lead but also prevent cracking. Generally, newly bought ceramic cups will not crack. It's best not to buy those brightly colored ceramics. Those colored ceramics contain lead, which is in the pigment.

Extended information:

Precautions for cleaning the glass:

It is best to clean the glass immediately after each use. If it is too troublesome, it should be cleaned at least once a day. You can wash it before going to bed at night and then dry it. When cleaning the cup, not only the mouth of the cup, but also the bottom and wall of the cup should not be ignored, especially the bottom of the cup, which may precipitate a lot of bacteria and impurities if it is not cleaned often.

Professor Cai Chun specially reminds female friends that lipstick not only contains chemical components, but also easily absorbs harmful substances and pathogens in the air. When drinking water, it will bring harmful substances into the body, so the lipstick left at the mouth of the cup must be cleaned.

Baidu encyclopedia: glass