Hi Wayne – If you are going to put a darker dye on it, you may not worry about the fingerprint. If it is a concern, I would test out Fieblings Saddle Soap. This is a product designed to clean up veg-tan leather. Just note that it can darken the leather a little. Personally I would test things out on a scrap piece before using it on a belt to make sure it has the desired result. Good luck!