Any tips to stop cats shitting on my lawn??

[Mouthfulofquiz]

AIBU to ask if you clever people have any tips that work? I've never had a garden before so never had this problem. I'm not in any way a cat hater, and although I wish they would just poop in their owner's gardens, I accept that this is never going to happen! Hence asking for any suggestions.
Anyway - I was just doing some gardening and put my hand on a bit and I am so grossed out. The smell has gone up my nose and may never come out.
Thanks in advance :-)

Green gel crystals in a bottle from the garden centre. Not expensive, biodegradable, safe with kids and wildlife.

One of my cats was a so and so about using the lawn instead of the flowerbeds in the peat carefully spread to enable him to get on with it and that stopped him overnight. I used to spread it quite thickly, and it lasted a good long time before I had to do it again.

I'm having problems with MY cats pooping on MY lawn - and I know for a fact it is them! They used to use the litter tray, then then braved the garden and pooped in my flower beds - now they are simply pooping all over the lawn. They never venture out of my garden, so at least they aren't messing with my neighbours lawns! They are nearly 13 years old - I got them nearly a year ago from Cats Protection and although I have had many cats in my time - I have never had a cat that shat on the lawn!

I've got a cat and it still don't stop other cats pooping.

So I've got this problem - but I'm pretty sure it's my own cat! Anyone else got this problem??

May I suggest that in the UK and in most European countries, Catwatch from Concept Research based in Stevenage, Hertfordshire could be the humane answer to deterring cats without harming the cat.
Made in the UK and tested and approved by The RSPB since 2005.