This was a funny and informative thread. I was curious how it would turn out. Sharpie threads are kind of amazing in the sense that either people want to remove a stray mark or a signature it is a chore to get them out or, like in your case, something needs to be washed but odds are high that the Sharpie will wash right out. I'm glad it worked out well for you.
I will say that cat pee smells awful and the enzyme cleaners smell almost as terrible. We had to get rid of a couch a couple years ago when one of our cats went a-hole mode and started peeing on it.