Personally I just remove the area around uranates or poop and check to see if there is any ... smearing. Whip that up (in my case it is very very rare) and add some fresh substrate.
Pine seems to be a bit of a debate, I have read well respected sources that say it is ok and that it is toxic. I don't know myself so I'd avoid it.
I just had a thought isn't most paper made from pine? I would think bleaching and such would remove the oils from it. Just a passing thought...
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