Use a brush and lukewarm water to get rid of dirt and mud. Wipe off the shoes with a towel.
Care of your shoes
Apply shoewax to treat the leather, use your hands or a towel. Wipe of any excess. The wax will care of the leather and build a water resistent surface. Be aware of that the leather can darken a bit. Let the shoes rest while.
You can use shoe spray to impregnate the shoes. But it will not care for the leather as the wax does. It builds a waterresistent surface. And you need to redo this pretty often as the surface that the shoe spray creates ware off.