I would like to repeal all cats

I think there are repellant sprays you can buy from pet shops, not sure how effective they are though. I used to keep guinea pigs as a child, and nothing I tried could keep the neighbourhood cats away. I once found the neighbour's cat eating one of my guinea pigs. They also used to break into my aviary and kill my birds for fun. Needless to say, I am not fond of cats and I think they should be confined indoors by law.

If you can afford to trap them, that might be a solution. But they're born killers really, the instinct is so strong in them.

Good luck!