Just rub it down with CLP.
Rub a little saddle soap on the leather handle and the sheath.
RESIST THE URGE TO GLASS BEAD! RESIST THE URGE TO PULL THE LEATHER RINGS OFF THE HASP.
DO NOT USE SCOTCHBRIGHT! Take a piece of heavy canvas and rub the thing with CLP. Dirt and grime will fly away, and the original piece will shine.
Saddle soap will keep the leather in the hasp and sheath pliant and in good health.