Has anybody found an effective way of deterring cats from the garden?

I'm sure somewhere on my property is a sign in cat speak that reads 'Public
Toilet'. A good part of my time gardening is spent clearing up their mess (I
thought they were supposed to bury it).

I would be quite happy to shoot them but feel the law may not agree with my
view that they are vermin and should be eradicated.

Do the pellets work or has anyone tried those ultrasonic device?

Any tips much appreciated.

Mel.

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