I long ago came to the conclusion that putting anything in the pot, like wax, does nothing except make smoke and mess. I get, and keep, my lead clean just by frequent stirring. The unwanted 'stuff' comes to the surface and I skim off.
Think about it, whatever gunk you use for flux isn't going to sink and perform miracles. It will just float, smoke and look like a mess. Stirring alone separates lead and lead-alloy from unwanted dirt.
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