I will have to lift some sections of the paving that sunk in and then sift the sand. Refill the hole and tamp it down. Then a layer of course salt on top will do the trick. Old car oil is out of the question, and thankfully we have no termites here.
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Always depends on what you dealing with, salt, spirit vinegar both great to fall back on, too many regulations around, far too expensive in any case.
They reckon that coarse salt works the best.