Underwear Cleaning Frequency
Two days at the most.
On the second day, bacteria will start to grow on your underwear in the groin area, especially if you've been sweating.
On the third day, the fungus may start growing too.
By the fourth or fifth day, you're likely to get a very itchy and uncomfortable fungal infection.
If you sweat a lot, you may need to change your underwear after a workout or a sweat bringing activity.
When your underwear has a stain that cant be removed, you should do away with that underwear
At least change all set of underwear every six months.
Underwear Care Guide
1 Clean the underwear in time: Do not let the underwear stay overnights; do not soak for a long time, otherwise, it will easily breed bacteria and increase the difficulty of cleaning.
2 Hand washing is best; if it is machine wash, it is best to put the underwear into the laundry bag and wash it. The dark color can't be mixed. It should be separated or washed separately.
3 The cleaning agent is best to use soapy water or laundry detergent, the utensils are preferably dedicated, the water temperature does not exceed 30 degrees.
4 Underwear should not be wrung out and direct exposure under sunshine. Otherwise, underwear tends to be hard, deformed, and fad color.