To piggy-back on the spray bottle thing... spraying a cat with water works very well as they hate it and it doesn't really harm them, BUT it works much better if you can do it in a way that they can't see you. If they know you're spraying them they'll just continue the behaviour when you aren't around. If they think scratching the couch actually elicits a spray of water from whatever cat god they believe in, they won't. Results may vary.
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