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.
(
wakeupandsmellthebacon, Tue 28 Jul 2015, 8:39,
Reply)
Humpf
If I was a German pensionner, I could simply have a Panther.
And flatten the fuckers.
(, Tue 28 Jul 2015, 18:38, Reply)