There's this stuff called "INK OUT" It comes in a small tube that looks like "stick glue" You can get it at most drug stores. It's a little expensive, but not nearly as much as replacing and breaking in another pair of boots. Follow the directions. I used it on our couches after a roommate of ours splattered white acrylic paint on ours, and it works! Risky, yes, but buying new couches/boots wasn't an option. If you can't find this. Try Murphy's oil soap. Always a "safe" bet. not sure if it will work. At least you'd oil, clean your boots! Good luck. I hope this helps.