Please help how to I do disencourage my neighbours cat from our tiny sunny countyard garden

[Londonrach1]

I've had it...the cat looks at me and poos whilst I'm opening the door to get out... It's hell. I have a dd and ok it's a small garden but we like to use it. Neighbour who owns the cat is vvv strange.. what's app me to say a leaf from our cherry tree has landed in her garden and her cat might eat it...we've tried electric noisy things, a plastic snake, old cd that shines and some black cat shadow things... nothing...it seems to wait till I'm.in the kitchen and poo in front of me.... suspect neighbour taught it.. what would work that not hurt it. It's very beautiful, just the poo. Isn't. We going to sell and move shortly due to this cat, it honestly is making life hell. My next door neighbour who's elderly have similar issues with the cat...who much poo can this cat do

We going to sell and move shortly due to this cat, it honestly is making life hell.
this cannot be real

Well no-one's suggesting you ingest the cat shit are they? If cats get chemicals on their paws or fur then they'll ingest it when they're grooming themselves. Considering we don't clean ourselves with our tongues and have the capacity to use hot water, soap and other disinfectants, I'd suggest that this is a ridiculous argument.
And there's a world of difference between "using a legal chemical" and deliberately putting a known cat poison in areas where a cat might deliberately get it on themselves; especially when there are a large number of non-harmful methods of deterring a cat that have aleady been suggested in this thread.
As to your third point, yes I do think that more people can and should car-proof their gardens but I can't make people agree with me on that score.

Some might argue spraying the sofa with a concoction that smells worse than rabbit piss in order to prevent rabbit piss is a spectacular own goal.

You can bleat on all you like. if you own a cat, it's your responsibility to make sure you keep them safe. There are lots of things that are toxic to cats.
If I need to use a legal chemical on my property I will do. You should stop the cat from being able to leave your property.
I use jeyes fluid to clean my greenhouse, patio furniture and drains, all perfectly reasonable uses

Reading comprehension is clearly not your strongest asset is it?

Water. We keep a small bottle of water by the door and just undo the lid and squirt in the direction of the offending cat. Doesn't hurt and puts them off.

😆