I think the only solution here is regular changing and cleaning of tray. Let’s face it, poop stinks no matter what you try to mask it

The only thing that works for us is frequently changing and giving the kitty litter tray a deep clean once a fortnight

We use clumping cat litter and scoop everyday. We also have a second cat litter outside in our cat enclosure. We’ve tried so many brands but did not have much success for masking smell so got worn down to frequency of changing it.

I have recently changed to course wood shavings and noticed less smell. I also remove number 2’s as soon as possible.

I haven’t seen any that can do that. But I think here is the best thing – litter.