From the use of functionality to consider, the water cup is used in summer or winter, is to drink water or tea with. Plastic cups Before use, put a few slices of orange peel and lemon peel in the new cup, or pour a few drops of vinegar, and then pour full of water, soak overnight. The next day, wash the cup inside and out with water. Soaking in rice water overnight also works. Stainless steel cup Scrub the new stainless steel cup with a soft cloth dipped in some detergent, and then finally scald it with boiling water. If it is a stainless steel insulation cup, can not be cleaned with detergent, salt, etc., otherwise the lining of the insulation cup will be damaged by detergent and salt. You can put one or two drops of vinegar in warm water, pour it into the cup, and leave it in the state without a lid for half an hour, then scrub it with a soft cloth.