Leather is one of the most fashionable, historically stylish and eco destroying materials in the fashion industry. It is literally made out of an animal. Or more. But once that happened, there are ways to have maintain its good quality. To do so, wipe down visible dirt with a damp yet wrung out cloth. If there are stains left, clean it by using toothpaste or aerosol hairspray. Against harsh weather, get some leather conditioner. This way the jacket maintains quality and can be sold if not needed anymore.