How to get cat pee smell off of leather/fake leather?

I ust bought three pairs of shoes off of ebay, all one bid, and I was really excited to get them, especially one certain pair I was getting in the lot. I came home to find a big package and was super excited, until I opened it and tey reeked of cat piss. Two of the shoes I don't care if I have to just throw away but would like to keep if I could, one pair though I'd hate to throw away. The pair brand new costs like $50 a pair and you can't find very many used. I'm not sure if they're real leather or fake, but I need to get the cat pee smell out of them.