Bitter Apple and a spray are the best deterrents for this, however, the cat may have some deeper problems causing this behavior.

Have your friend get a full vet check-up first. Then if all is clear, perhaps the cat can have some medication untill it unlearns the bevavior.

Good luck. It is tough to be a friend and yet not be able to help out fully!
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Smile, it will make them wonder what you are up to!

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