Lion poo. Seriously, cats fear bigger cats
https://www.amazon.co.uk/Silent-Roar-Lion-Manure-Repellant/dp/B0002B7OT2
( https://www.amazon.co.uk/Silent-Roar-Lion-Manure-Repellant/dp/B0002B7OT2 ) this any good?
Well you could trace some lions back to their den depending on where you live... There is sure to be some lion dung nearby!
Personally though, I'll just get it on Amazon Prime for next day delivery:
Use lion manure.
Lion crap. no seriously, theres some pheromones in it or something that if a cat smells it it will NOPE outta there. https://www.amazon.co.uk/Silent-Roar-Lion-Manure-Repellant/dp/B0002B7OT2
That explains why this stuff http://www.amazon.co.uk/Silent-Roar-Lion-Manure-Repellant/dp/B0002B7OT2 doesn't stop my neighbours cat shitting in my garden!
Maybe I need a real lion next time.