Using a dry cloth, massage a little amount of leather conditioner all over the belt, covering both sides. Allow your belt to air dry after that.
Wipe your belt with a towel and allowing it to dry naturally if it gets wet. Allow it to air dry in an open location at room temperature. Hair dryers, for example, should not be used.
Simply wipe your belt down with a lukewarm moist cloth to clean it, at times.