I've settled for Clean n Tidy (the pink one). Although, yes, it does track a bit, it's easy to brush up quickly each time I do the litter and that seems to prevent it spreading through the house. Otherwise, it's nice on the cats' paws, it clumps beautifully, and best of all it doesn't ever stink. In fact, it smells vaguely pleasant, even if it's been well-used. It may not be the cheapest but it seems to go a long way.
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I find the Cats Best OKO Plus easier to sweep up than the Clean and Tidy - I have carpet in my room. i am going to use the rest of the Clean and Tidy with Sam and Kizzy and see how htey cope - last time I had it in the kitchen, it was with a blind foster, so i couldnt complain about sweeping twice a day.