I know you can sprinkle down bicarbonate of soda and leave for as long as you can (pref over night) and then Hoover it up as it has deodorising properties
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I would imagine it's not harmful to rabbits, as we can eat it, I've used it on my carpet before. Although willow wasn't a house rabbit he did come in sometimes, and have other pets,they were fine too!
I think you can by boxes (rather than little pots for baking!) in pound shops:thumb: