I've tried lots of things, but the very best set up for smell that I've found has been a combination of Care Fresh and Yesterday's News. YN is great for odor control, and CF absorbs moisture and gives the little rattikins a softer feel for their feet. I think mixing in YN with almost anything (because it can get expensive) would work well. Good luck!
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Eileen
I WUV RATTIES
Georgie, Lennon, 'Cartney, Ringo, Sophia, Sunny, Stormy, Jazzie, Peanut, and Ginger