The problem is cats don't know old from new. I had a chair that was old and my cats scratched the heck out of it. When I got new furniture, they went right for it. I had to retrain them to use the scratching post.

Have you tried getting rug tape, which is a stronger two-sided tape. Put scratching posts where they have been scratching. Everytime you see one of them hitting your beautiful chaise, squirt them with water (not in the face, but the shoulders, back side). You can also take them over to a scratching post and make the motions with their paws.

I don't know of any remedies that will keep a catch from scratching. And declawing is sheer cruelty.

Good luck.