I recently purchased some Cole Haan Men's Air Keating slip-on shoes for work (http://www.amazon.com/gp/product/B004NNFK0A/ref=oh_details_o03_s00_i00). I don't recall if I got the Black or Black Polish. Either way, it is black. I've never polished shoes before and wonder if different materials have different techniques or materials for polishing. Which would apply for mine?