I dont know of any spray but i have herd if you find a sctraching post a cat likes and put it were he is stcraching he will start to stcrach that and then little by little you can move it. Kinda like potty trainging a puppy. Sometimes they do go back and claw the couch agin so you have to start over agin but that can happen when your working with anything.
Catnip is crazy. We dont buy it any more because my cat freaked out on it. We got a bed that had some in it and the cat started to eat the bottom of the bed trying to get to it. After a wile i took the cover off the bed and found a big bag of it so i put it up. the next day we went out to eat. When we came back the cat was being a total spaz. he had gotten to the cat nip riped it open munched on half of it and the other half was scattered around the house. I had no clue he could jump up there to get it. he wouldnt even jump on the table.
My cats have also had a few episodes with the baggies of catnip. One of them likes it but doesn't get too carried away. The other one though (the scratcher) just goes berzerk! He loves that stuff. I use it to draw him to the scratching post but unfortunately it makes a tremendous mess. I still use it though. I wish he'd leave my furniture alone.
you can try putting double sided tape on the places where he is scratching. either that or get a water bottle and spray the cat every time you see it scratching on its furniture.
sometimes its better to have more than one scratching post-- like i have one rope bound one, one thick shag carpet one and a large tightly woven carpet one. My kitten PB (almost a year old) scratches on the big one the most and the sisal wrapped one second most. Also, the scratching post needs to be really stable as most cats put their whole bodies and weight into scratching.
I saw some repelent spray in Wal-mart that is supose to discourage pets from areas.But I cant remember the name. I also herd of a green apple spray you can use.
My cat would lay on my sunroof(car) and leave dirt and hair stuck to it so I put a strip of regular aluminum foil on it when i leave it parked and it keeps her away.
I personally would NEVER declaw. Scratching is natural for cats, that's how they remove the old sleve and expose they're new claws. I wouldnt want some one to cut the first joint off my fingers. My friends' cat looked miserble after the procedure and suffred just trying to use the litter. I wouldnt reccomend it. Try to find a solution first.
They do make a catnip spray too, that's what we spray on the scratching posts we have. You can get it at petco, probably other places as well. And they still freak out on it. Just make sure you wash your hands afterwards, yeah... or it could be painful/