Usually the underwear is changed about once every six months, the specific time also depends on the overall cleanliness and use of the underwear. For the common situation to replace the panties time for: 1, normal situation: if the vagina is relatively clean in daily life, generally a day to change the panties, six months for new panties; 2, improper cleaning: vulvar skin is more sensitive, if some people because of improper cleaning methods, not only make the panties broken, but also may lead to damage to the cotton fibers of the panties, yellowing, hard, at this time should be replaced out of the panties; 3, seasonal reasons: different seasons, such as summer is easy to sweat, can be replaced for a short time to clean the panties; 3, seasonal reasons: different seasons, the time to replace underwear is also different, such as summer is easy to sweat, can be a short time to replace the cleaning underwear. Change new can also be earlier than the general situation, can be a quarter a change; 4, menstruation or secretion abnormal: when in the menstruation period or secretion abnormal, need to change the panties diligently. There are foreign body residue, timely replacement cleaning, you can also choose disposable underwear, diligent replacement of new. Washing underwear should choose a weak alkaline or neutral washing solution. If the secretion is abnormal, washing with cold water plus weak alkaline washing solution can be good to make the protein hydrolysis and easier to clean. After the panties are cleaned, do not expose them to the sun. Newly bought panties need to be washed before wearing them.