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Peppers . Mywife uses red pepper an Chuli powder,cayenne pepper. Seems to help. Club size containers at Dollarama or similar stores.. worth a try not all that expensive. Cats are clean, dang hust use your own toilet an not the neighbours. good luck.

Your house has become the neighborhood litter box. The smell draws them now, as well as, habit, plus they're marking territory.

Get some Nature's Miracle, and hit everything that won't get rained on. "The bacteria-based formula produces enzymes when it comes in contact with bio-based messes to target urine and freshens with a light fresh scent." It works. You may have to reapply occasionally.

Get a dog is actually the best defense, if you can. In lieu of that, you can get dehydrated coyote pee online. Cats smell where predators have been, and vamoose. Maybe you could borrow a dog to come pee around your house!

The other thing they hate is old-fashioned mothballs, if you can stand the smell yourself. The kind where the smell permeates the air. Just don't breathe it yourself.

Hope one of these helps.

We have a nature park a few miles from here, with what are purported to be Barbary lions. Maybe they'll let me borrow them for a weekend!