Carpet and upholstery Cleaning is my day job.Enzymes work great on carpet and furniture.Your problem is that pee is in the foam never get it out.The only thing you can do is cut the side of you cushion remove the foam and get new foam.Than put the cover in the washing machine on hot cycle with some enzymes,trick is to get your cover back on the new foam when it is wet if you let it dry you will NEVER get it back on.Trust me 30 years here.
