So Gremlin is my room mate's cat. We've had him since he was a wee little kitten. He was neutered at probably 8 months old. He's close to 4 years old.
At some point he started spraying in the house. His orginial playing with the other cats got too rough. Gremlin is a boney little cat and he was trying to pick on cats that could sit on him and not notice. So when they got tired of it, well, he lost a patch of fur. He continued to dive bomb them after they got out of the litter box. We used squirt bottles to discourage this behavior. I think he started spraying because the other cats are clearly top kitties due to their size.
Anyway, about a year ago, he sprayed about 15 places in the house in one day. Thats when we had enough. So he went into my room mates bedroom for isolation from the other cats.
Gremlin is affectionate to the point of being annoying- always wants in your lap, sticks himself between you and whatever you happen to be paying attention to- the computer, another person, a book etc. We figured he started the fighting and passive aggressive peeing to basically "claim" people and drive away the competition for affection.
Anyway, he's been in my room mates bedroom for a year now. (Which is like where my room mate spends 80% of his life so the cat gets plenty of attention).
Problem is he keeps spraying the door. We have put puppy pads on the door for easy clean up... but seriously, within an hour of it being replaced he will pee there again. He also pees on fans, the a/c unit, the computer fan.. anything that could spread the scent around the room faster.
I've tried Feliway, catnip, putting a scratching door hanger on the door, moving the litter box closer (can't restrict the opening of the door though), giving him lots of play things, giving him places high up to hang out, giving him outside play time (in a harness), and of course asking him nicely to use the litter box. Any other potential ideas? I really feel like if he was in a one cat house this wouldn't be an issue but thats just not possible here.