Fill a bucket with warm water and a couple capfuls of liquid saddle soap. Mix to create a mild soapy solution.
Dip a clean cloth in the saddle soap solution and scrub the leather surface. Work the soapy solution into the leather so it can remove dirt hiding in the pores. Replenish the soapy solution on your cleaning cloth and continue to scrub the leather surface.
Dampen a clean sponge with cool water. Wipe the leather surface to remove the saddle soap solution and any remaining traces of dirt.
Pour a small amount of leather deglazer onto a clean, white cloth. Wipe the leather surface, moving in one direction, to remove any existing finish or dye on the leather. Move to a clean portion of the cloth or change cloths as the leather finish transfers to the cleaning cloth.
Let your leather good air dry for 24 hours, to ensure all moisture is gone, before you begin the process of dying it a new color.