My DD has 13 cats - 6 inside and 7 outside.
I have had similar problems, and most recently, one of them peed on the satin choir stoles I was working on. Luckily it is costume satin and washable. I put in washer with All clear/unscented detergent, with a scoop of OxyClean and a 1/2 cap of Clorox 2 on permanent press. When finished, I held up and checked for cat smell. Had none (if there had been any smell, I would have done process over until no smell. You do not want to put in dryer until all the smell is gone) so put in dryer with Bounce sheet and dried on permanent press. Worked fine and took smell all way out.
I have used this same method for 6 yards of batting, two table runners, and various pieces of fabric they have used for their busines over the past year or so. Alway's works. Thankfully they only do this occasionally, but still one too many times for me.
If I could only figure out how to get the smell out of the cutting mat now, I would have it made. Good luck.