Get yourself a deer bone, like Will sells here. These things are absolute magic on cordovan. They polish out scrapes and scratches phenomenally well. You can read up on how to use them, but essentially you just take the smooth side of the bone and rub it with some good force in a circular motion on the scuff (you'll need shoe trees in to do this). The shoe will start to look really waxy and dull. Then give it a strong brushing and you'll have shiny smooth cordovan.
7/7/12 at 5:58pm