Apologies if I have missed it, and I suspect this is going to be a long shot, but while I have seen plenty of advice on conditioners and polish for this leather, I can't recall seeing much on heavy duty cleaning beyond brushing and wiping down with a cloth or sponge, and that is the most I have ever done. So far, so good, but it's early days. Given what rain can do to the appearance of horse arse, I suspect many in this community (Crane excepted) never allow water anywhere near their shell Cordovan shoes, but is anyone out there using actual cleaning products before they apply conditioners, shoe cream and polish? Bootmakers active online (like DWFII and Knight of Malta) have advised that dirt and other foreign matter can start to cut away at leather fibres if not properly removed, and that old polish and conditioner and other product residue should also be removed before conditioning. They suggest that brushing and a wipe-down are not sufficient. While they mostly seem to refer to calf leather, surely the situation is similar for shell Cordovan, is it not?