as long as the area smells of cat- cats will continue to mark it.
a good clean, and then a deterrent ususally does the trick;
you can buy electronic cat scare devices
(motion senser rigged to a speaker- when activated, the specker emits a blast of high pitched sound thats out of human hearing range- but not the cat's. also works with dogs too.)
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get some moth ball flakes and sprinkle around the area. It may smell a little to you but my understanding is that it smells worse to cats. you should be able to get a can of moth ball flakes at the grocery store.
Get some dogs to bark at them.