I expect this has been asked before, however, I don't visit the group very
often so here goes.
Can anyone comment on the success (or otherwise) of strategies to prevent
cats fouling their garden.

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? and is price related to efficiency?

Ditto chemicals, or cat deterring plants?

Ditto rubber spikes on fences?

Ditto any other non-harmful methods?

Any constructive suggestions welcomed.

Don