If you have an article of clothing with set-in coffee or tea stains, don't despair. Just soak it in a solution of 1 unit vinegar to 2 units water and then hang the item to dry in the sun.

不要对衣服上的咖啡渍或茶渍感到绝望，把衣服泡在醋和水1：2混合的溶液里，然后放在阳光下晾干就好了。