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I would be careful how much Eucalyptus oil you use. Eucalyptus oil contains the same toxic chemicals that cedar and pine contain. In an extreme case like yours it might be worth the risk, but you might just end up causing more damage.
If your snakes RI doesn't go away quickly you are going to have to get it to a vet. There are multiple possible causes of RI, and they require different treatments. Only a vet running a culture can tell you which.
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