okay this is going to sound funny but i was told of this product by a friend that worked at a vet. My carpet was soaked from my cat peeing on it for a month while my husband was in the hospital and my house sitters bought the wrong cat litter. but anyway. it is called Mr. Max's anti icky poo. the website is http://www.catfaeries.com The stuff does work but you do have to follow the intructions, I don't know what it would do to the boots but i say its worth a shot, since they are pretty much ruined, but it has to stay on there wet for a few days until the smell is gone. you have to keep reappling. keeping it wet is what helps the stuff to break down the urine. I keep the stuff in my house it works great on all kinds of stains, even blood.