You might want to consider switching to the baking soda, the baby powder is made up of very fine particles and is not good for your cats to inhale, although I bet it does smell nice.
I use Arm & Hammer litter freshener. It is by far the best thing I have ever tried and my very fussy cats actually like the fresh clean scent it has. I had a male cat at one time with very strong smelling urine and it worked even on that! Just use according to the directions. I sprinkle a little every day when I scoop. Almost like not having a litter box in the house any more! Of course the kind of cat litter you use makes a BIG difference as well.
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