Hi ani-lover,
I highly recommend Woody Pet, or a similar wood pellet product, for litter use.
I've got 8 house rabbits and have tried just about every other litter product available.
Carefresh is good for bedding, but doesn't do much for eliminating urine odor. And it's a lot more expensive.
I pay about $5 for a 30 pound bag of Woody Pet. You only need about 1/2 inch in the pan, so it goes a long way.
Here's a link to a thread about different brands of wood pellets:
http://rabbitsonline.net/view_topic.php?id=15881&forum_id=1
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Adding vanilla to the drinking water is suppose to help eliminate theurine odor and is sometimes used to help prevent flystrike.......lessodor = less flies.
It may prompt them to drink more and help dilute the urine as well.
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Yucca is included in some feeds and is suppose tohelp reduceurine odor.
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~Jim