Just polish it with a brush after cleaning with a cloth This is precisely the care (or lack thereof) that's led to my cordovan shoes cracking. I bought the line about shell cordovan imperviousness hook, line, and sinker, and I regret it now. While it's certainly more durable than calf, it clearly does require some conditioning from time to time, especially when enduring rain, show, and salt. I'm just wondering what to use. Mink oil? Mineral oil? Lexall? Neetsfoot?