If you don't have kids
you could try a small sand/gravel pit, cats prefer to shit and cover it over so they might concentrate their shit there.
Some DIY stores sell cat repellant, not sure if it works.
We have 2 cats and a dog and still get cats from the neighbourhood sitting in our garden.
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wakeupandsmellthebacon, Tue 28 Jul 2015, 8:39,
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