Method 1: Wipe the moldy part with a brush and a clean cloth, and then wipe it evenly with a little leather oil (not suitable for polishing leather). Before wiping, try to wipe on the less obvious parts of the leather. If oil stains penetrate or change color, stop using them immediately. After wiping, hang it in a cool and ventilated place with a hanger for about 24 hours, and then clean the leather surface with a clean cloth. Wipe off the residual skin oil.

Method 2: Brush off the floating dust with a brush, then wipe off the mildew with a cotton ball dipped in alcohol, or wipe it with weak alkaline water, then wipe it with a dry towel, dry it in a cool and ventilated place, and then coat it with jacket oil. For leather clothes that have been stored for a long time, you can first wipe them with a towel dipped in 4% high-grade soap solution, then clean them with water, and finally dry them.