Why can't underwear be washed out after wearing for a long time and the crotch position will change color?

1. Urine: Human urine is acidic and alkaline, usually yellow, and is secreted by human excrement and dregs. After a woman goes to the toilet, if she doesn't wipe her private parts with a paper towel, urine residue will form in her underwear, and slowly her underwear will turn yellow.

2, material: nylon underwear, low sweat absorption, airtight, poor light resistance, easy to yellow and aging after long exposure. It is more suitable for women to choose cotton underwear, which has good hygroscopicity and warmth, and is soft and comfortable.

3, most women will accidentally get menstrual blood on their crotch during menstruation, and underwear stained with menstrual blood is generally not easy to wash off, and there will always be yellow marks on the crotch. It is recommended to soak in underwear detergent 10-20 minutes, and then rub it by hand. Do not use bleach, because its chloride is highly irritating and there may be chemical residues.

Extended data:

Precautions:

1, it is best to change it once every six months, especially if it is deformed or hardened, or if there are stains that cannot be washed out, it should be replaced in time.

2, it is best to change the wash every day. Especially in summer, because of sweating, bacteria will multiply.

Don't mix with other clothes. It is easy to bring foreign germs to underwear.

4. Dry. This can prevent the growth of mold.

5. Don't turn it over to dry. Because dust and bacteria in the air can be easily brought to clothes.

6, you can sleep without underwear, let the genitals ventilate and reduce the growth of bacteria.

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