I had a recent run-in with cat urine--not with ponies, but with my pony hair for customizing. Our new little kitten saw the box with the bags of hair and must have thought it was a litterbox.... I had to take all the hair out and clean everything. I used detergent and an enzymatic cleaner designed for getting rid of pet odors, and it worked very well to get rid of the smell. It was just a royal pain to have to take all of the hanks out of their bags and wash them individually.