questionswhich do you think it the cleanest and easiest…

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The one that doesn't exist.

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@kd1357: Couldn't have said it better. :)

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The only working litter box is the cat door to outside.

Unscented Arm and Hammer clumping or multicat work great when I have to house sit trapped cats.

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If you actually want an answer, I would say the Litter Robot. The other automatic ones don't work, get clumpy, and break down. The toilet one requires special crystals and a water connection -- haven't tried that one. Only downside to the Robot other than cost is that you can't go more than a week without changing it. I'm talking vacation here, not just don't feel like changing it.

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Non automated, clumping litter, changed every day: cleanest, easiest, cheapest for indoor cats. :)