How to Clean a Shofar
The easiest method is to use a diluted acid (vinegar) or base (soap). Some use hydrogen peroxide or ethyl alcohol. Other reagents can destroy the keratin and thus, threaten the integrity of the horn.
1. Use a long coffee brush; aquarium brush; test tube brush or whatever can fit into your Shofar without hurting its walls.
2. Dry your horn with the brushes. In the case of alcohol it will dry itself. You can also hair driers and such.