1. The hardening of the socks after washing is due to fiber aging and impurity deposition. If there is no softening liquid, you can boil it with boiling water and washing powder for 20 minutes, and then it will be soft as new after washing.
2. Put a little vinegar to soak in the final wash, or soak it in the water that has been washed for a while and then wash it, and then dry it to keep it soft.
3. Regardless of whether the stockings are of good quality or poor quality, soak them with a little salt water before wearing them, and put them in the freezer of the refrigerator for about half an hour, and then take them out and let them dry naturally, so that the fibers will become It's tougher and more wear-resistant.