solution to cats sh*tt*ng all over your garden find there perferd access point they will have one cats are a creature of habit and paint a little chill paste on that point(top of fence etc) cat will jump up get chill paste on paws will lick it off to stay clean and this will make the cat very sick cat,it will remember and won’t come back to your garden as it will remind it of its guts turning inside out.
p.s before anyone goes off on one this won’t kill the cat or do any long trem damage and on top of that i could give a flying f*** as i hate the little sh*t producing things.