I use one of these air globes:
fresh air globe | eBay
and put tap-a-drop in it, but what's it for? If it's to cover any smell from your rabbit, it wont magically get rid of everything and make your house smell like a pefume factory. And rabbits if cleaned out properly don't really smell, the litterbox can, but if you empty it every day or so you shouldn't have a problem. All small animals have a certain smell about them, go into anywhere that keeps them and it's instantly recognizable as a 'rodent place'. All animals have some sort of smell so you won't get rid of every trace though whatever you use. In fact the only animal I have had (and I've had a
lot), that was pretty much totally odor free is a chinchilla. Oh and a hoover won't really get rid of smells unless you suck the bedding up so it isn't there in the first place!