NaOH is a toilet cleaner. Let the residual naphtha evaporate, then flush the sludge. Naphtha can also be evaporated to recover a little more product, or used as a fuel supplement for funky-smelling exhaust, perhaps! Vinegar pulls on the naphtha will allow you to recover product without having to evaporate a load of solvent.
I think we should have a specific resource covering waste disposal questions.
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