I highly recommend using vinegar and water. It is safe for the environment and your hamster. It will kill the germs and you just have to rinse well so the hamster doesn't smell it in his/her cage. And, it doesn't cost much at all! I use it on my rabbit litter boxes regularly as it breaks down urine and keeps urine from staining the boxes.
Source(s):
director of a rescue, www.rascallyrabbitrescue.org, and veterinary technician

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