In order to reach the original soft state of leather, it is necessary to return oil. Spread the leather coat flat first, dip the towel in warm water, and then wipe it all up and down. When it is dry, wrap the freshly killed old hen oil with a piece of gauze, rub all parts of the leather coat evenly, then hang it in the shade to dry, then wipe all parts with a clean soft cloth and leave it for about 20 minutes to wear. Milk can be used at any time after returning oil to prevent leather from cracking and make it soft and beautiful. Leather has pores and needs air. Never use leather brightener for maintenance. It will clog pores and harden leather for a long time. In addition, you can't use other livestock oil to return oil, because it smells of shame.