Pet Mice smell extremely bad?

I recently bought a pair of female mice from petco a little less than a week ago. Within 24 hours their cage STUNK. The whole room smells like poop. I have a rabbit and she doesn’t smell nearly as bad as them. I use Kaytee clean and cozy which I’ve never used before but I don’t think that’s the problem. What can I... show more I recently bought a pair of female mice from petco a little less than a week ago. Within 24 hours their cage STUNK. The whole room smells like poop. I have a rabbit and she doesn’t smell nearly as bad as them. I use Kaytee clean and cozy which I’ve never used before but I don’t think that’s the problem. What can I do?! They’re stinking up the whole room to the point I can smell them in the hall way
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