I'm sure I sound like a broken record by now but Clomicalm has been a godsend for me. Boo is 16 now, has been the alpha male, until Specs came along and he's 7 1/2 now. The pee wars had me ready to boot them both. Clomicalm changed all that. As for getting the pee out, I've used Urine Gone successfully. It takes out the spot completely, even on hardwood, and removes the smell, too. If you haven't already, ask your vet about Clomicalm. It's usually recommended for dogs but my vet gave it to me for Specs and Boo and they've not experienced any side effects whatsoever. Good luck. I know how frustrating this can be.