1, wet. In spring, the room is easy to get wet, and the wardrobe is no exception, so it will lead to mildew of socks. The colors of mold may be yellow, green, gray and black.

2. Pollution. If there are cockroaches, rats and other excrement in the closet, the socks will turn yellow.

3. The fluorescent whitening agent is weakened. When socks are left for a long time, the effect of fluorescent whitening agent will be weakened, thus yellowing.

4. oxidation. Dirt or sweat stains on socks are not cleaned, which will make socks oxidized and lead to yellowing.

5, the sun is exposed. White socks can't be exposed to the sun, which easily leads to yellowing.

The second trick of washing yellow socks

1, first put the socks in clean water and rub them a few times without any detergent; Then wring it out, and evenly spread the toothpaste on the dyeing part; Then let it stand for more than five minutes, and then you can wash the dirt off it with soap.

2. If the white socks turn yellow, you can soak them in washing powder solution for half an hour before cleaning them.

3. Washing powder and soap: After the white socks turn yellow, soak them in the washing powder solution for about 10 minutes, then wash them by hand, rinse them twice, then put them on the soap for about 5 minutes, rub them hard for a while, and rinse them directly with clear water.

4. Baking soda: Washing white socks with diluted baking soda will have unexpected effects. Water temperature: It is recommended that the water temperature should not exceed 30℃ during cleaning. Too high water temperature will damage the special phase change materials and top microcapsule materials in socks and shorten the service life.

5. Use toothpaste: soak the white socks in clear water, do not put any detergent, rub them a few times and wring them out, then apply the toothpaste to the most difficult and dirty part and leave it for about 5 minutes. When you go to wash again, you can wash it with soap.