Small knowledge sharing:

Why does your new underwear smell bad when I just bought it? Now in the era of factory direct sales, the turnover time of wholesale and retail circulation has been greatly reduced, and new products have been obtained. That's because acetic acid is added to the bed cover printing and dyeing to produce pungent smell. Adding acetic acid, disinfection and other processes is to adjust the pH value in the printing and dyeing process without any harm to human body. After washing, the smell will gradually dissipate.
It is a wonderful way to remove underwear odor faster:
It can be treated with salt. Because salt can disinfect, sterilize and prevent fading of reactive dye cotton cloth. So the new underwear I just bought must be soaked in salt water for about ten minutes, then washed and OK :)
warm tips:

This underwear adopts Japanese hot spot pressure sticky technology, which is processed by high temperature pressing. Depending on the delivery time, the underwear will smell and will not affect wearing, generally, after washing for many times, the smell will fade slowly.