Go to your local home improvement center and get a cheap outside light with a motion sensor on it and a lawn sprinkling timing device that you attach to your outside faucet. You're ahead of me already aren't you?
Temporarily mount this light fixture at the spot where the cat obtains access to the roof. Remove the light bulb and install a screw-in socket in it's place. Plug in the timer and set it for the shortest sprinkle cycle, attach the hose to a sprinkler on the roof and turn the water on at the faucet. Then when the cat jumps up on the roof, the motion sensor will turn the sprinkler on, the cat jumps off and, after a few of those treatments, you can relax. Cats are smart and will avoid getting a bath from then on. Hope this helps.
Cats dislike the smell of citrus. Place oranges, lemons, or grapefruit (whole or peels), and scatter them on the roof. If you can get up there you can also spray the area with any lemon or citrus scented air spray directly onto the roof itself.
Please do not use moth balls. Moth balls are toxic for cats and although I know you don't enjoy its visits I am sure you would not like to kill it. Moth balls can kill or seriously affect a cat causing if not death, expensive vet bills which your neighbour could try to claim from you. Good luck. You may have to replace citrus from time to time as they become dried out.
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I am looking for a device to deter animals (not squirrels) from the roof?
By David Char from Roseville, CA
Spraying WD-40 will keep birds off of the roof. Not sure about other animals. It also will not harm them.