o my gosh how FRUSTRATING. cat pee is the worst, which I'm sure you know.
Have you ever tried to put his butt outside for a few when he just pees like that? Like right after he does it so he starts to pick up that when he pees, he goes outside? I dunno. Works for dogs.
Seems like it would be hard to break if he's an older cat. yikes.
My heart goes out to you..... lol
Have you ever tried to pick him up just as he starts to pee and put him in his box. Like everytime he pees?