Jeans or other dyed new clothes contain a layer of glue (the smell of new clothes), which can make clothes soft, and can also fix the color to prevent fading. For the jeans that are not too dirty, use detergent to wash them. Try not to use detergent. Generally, detergent contains a certain proportion of bleaching powder, which is easy to fade the jeans. In addition, please turn the jeans upside down and wash them, which can effectively extend their life.