Help! Neighbour not happy.

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Our 2 cats are a year old. Rescue cats and not indoor cats.

NDN has been round today to complain they are using 2 bits of his garden as a toilet. He is very not happy. It's smelly and burning his grass. I accept it may well be our cats as it's a new thing.

I need to quickly figure out how to stop them. They have a clean litter tray indoors which they used to use. I can't get him a high pitched noisy thing as dd has Sensory processing disorder and it will drive her mad. I have offered to try and clean up.
Is there anything I can do to put them off? I can put something in his garden (lion poo?)
TiA.

I used to have one of those high pitched sound box to deter cats when my sons were young. Both have asd and very sensitive hearing and neither appeared to notice.

Someone in our autism group is having a horror of a time with their NDN over one of the car scarers which was why I was hesitant. We'll have to trial it.

Super soaker?

See upthread. I offered to buy one. He works away and can't see that bit of his garden from his house...

Sorry, I think you are going to need to catproof your garden. This just isn't fair on your neighbours -they should not have to deal with large volumes of cat poo if they aren't cat slaves!

Just to come back to this.
Firstly whilst we could put up some cat proofing between our back garden and his, we cannot (physically can't as opposed to won't) proof the entire back and front garden.
Secondly on reflection, neither he nor us has seen the cats pooing in his garden.
Our cats do poo in our garden - there's a bit of flower bed they use. They cover it up. They cover poo up in the litter tray. The poo he is complaining about is on short grass with no attempt at covering.
Thirdly DH and dd have both seen foxes using the area as a run from some nearby woods. This was news to me.

DH is definitely thinking we may be getting the blame for fox poo. We looked earlier to see if there was any fresh poo and there isn't so we still haven't actually got any proof it is cats, ours or not.

I'd just ignore him then until he had proof. And even then there isn't much you can do to stop them.

Hopefully It's the foxes and not your problem then.

There is a cat scarer thing in a garden on our walk to school and I can hear it. It really annoys me. Took me weeks to figure out what it was. The children can hear it and one if the mums i walk with, but not the older mum I walk with so I think it must be one of those pitches you can't hear as you get older.

We had a major problem with cat poo from next door's cat which was very upsetting but we eventually solved by making garden access much more difficult for him (ensuring bins weren't next to fence, putting mesh over gaps in gate etc) plus getting an RSPB-approved sonic cat scarer. My 8 yr old can hear it but we have angled it so it only gets triggered by cats entering the garden and nothing else and we just switch it off when we are out in the garden. It has definitely worked. Could you locate a scarer pointing into his garden somewhere where you could access it to switch it off when your DC is outside? Or do they do one with a remote control maybe?
The great thing is we now have a number of garden birds using the garden

And now it turns out another neighbour has foxes living in their garden...