Feline Odor Neutralizer
Amadeus,
Here's the toll-free order line for purchasing FON - 1-866-838-6337. Or you can find a hundred places to order it on line by searching "FON and feline" in google or whatever.
Nature's Miracle works well, vinegar is ok, Odoban is better, but FON is the best I've found.
I second the idea of watching for other instances of inappropriate elimination - could signify urinary tract infection or crystals.
For all the cat-haters out there: The Big Cats are the ultimate Predators on this planet. They are the most accomplished Hunters and the most fearsome mammals around. Their small cousins reflect the grandeur of the larger Cats, are cheaper to feed, and don't wreck the house as badly as a tiger or snow leopard would.
My cats love guns. They are there when I clean guns, they are in the reloading room, batting cleaned cases around the floor while I load match ammo, and the way they watch the deer outside is the main reason the only loaded guns are in my immediate, positive control (i.e. holstered). There are no rats, mice, or significant bugs in my house or anywhere around it.
Cats are not rebellious, they are Free. They don't disobey rules, they know rules do not apply to them. They do what pleases them. When two or three park their furry selves in my lap, they're there because the choose to be - not because they need me to open a can. In a pinch, their claws can get through the aluminum modern cans are made of. They like the smell of Ed's Red, they like the smell of good gunleather, and they know they are worthy of respect. If more people thought themselves worthy of respect, there would be a lot less sheeple out there.
Purrrrs,
BobCat