Continued.... I have small kiddie pool filled with cheap sand on back end of property, and the visiting cats use it as a toliet, instead of my garden or flower beds. It's easily cleaned with a shovel and a garbage bag inside a 5 gallon bucket.
People who have problems with neighborhood cats using flower beds for toilets,  it's a cheap and easy remedy to a constant problem.
I should mention, at the moment, and for last 5 months, I have zero kitties who have come needing help. Fingers crossed.