A biker jacket should be kept clean, especially if it’s worn to events and other things. The easiest way to clean it is by using some leather cleaning spray. This is good if the jacket is only slightly dirty. Otherwise, you’ll want to use water and unscented dish soap. If the color runs, this method can’t be used, but it should be fine. After washing with soap, rinse with just water, then dry with a soft cloth. Kate Evelyn, an eHow contributor, gives the full details on how to do this.