Can anyone comment on the success (or otherwise) of strategies to prevent
cats fouling their garden.
Is there a DIY solution to this problem?

The ultrasonic devices I have seen on the internet range in price from about
£16 to approx £45 anyone care to pass on their experiences with these
devices? is price related to efficiency? Is it possible to build one of
these devices?

Ditto chemicals, or cat deterring plants?

Ditto rubber spikes on fences?

Ditto any other non-harmful methods?

Any constructive suggestions welcomed.

Don