How to remove grape juice stains on white clothes?

Edited and translated by Du Mingming, People's Daily Online

When eating grapes, the grape juice may stain white clothes and leave purple spots that are difficult to deterge. However, the stains can be removed using white vinegar. White vinegar is acidic, while grape juice is alkaline. When the two are mixed, it will result in neutralization. Thus, the stains will be washed off.