Halo Horse Tack Soap, a gentle leather soap that cleans and nourishes at the same time, it contains oils to feed the leather and essential oils to repel mold. 
Using a clean damp cloth apply the soap to the leather and thoroughly wipe it all over, then with a soft, clean , dry cloth wipe all the soap and grime off. Leave to dry thoroughly. Then if needed apply Halo tack wax to bring your tack back to looking like new.