To use: After wearing the shoes I free of superficial dirt (soft brush or cloth moistened very slightly) let them dry and wear a very thin, uniform layer with a soft cloth (old rag) on. An approximately 1 euro per large dollop Shoe sufficient. If the pollution was low often enough still greasy from previous times cloth. The leather is minimal darker by the treatment, sees matt-shiny but even after prolonged treatment still like new.
Even with very fine smooth leather is deeper scratches can be (I had a mishap with a sharp bike pedal) with the fat repaired again and make virtually invisible. Regular treatment the leather behaves almost like skin, so can be of virtually all dirt again free (z. B .: adhesive, mustard, salt).