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You have given a double meaning - if it's untreated, then there is NO creosote. If there IS creosote then it IS treated. -Which is it to be.
Mr Creosote was created in 1983.
the creosote bush lives in the desert
Moth balls will indeed remove creosote in small amounts. An example would be creosote residue in a wood burning stove pipe.
is creosote safe for wooden dog runs