Yes, you have to stir to mix the alloy and bring crap to the surface. Read Glens or Wacos articles on reducing. I dont[ know the chemistry of it, just what works for me.
Yep stir and mix the saw dust that is turning to charcoal, as it turns. Down into the pot. Then scrape the sides as it is working.
I kind of prefer a push down. Followed by a Slow but lengthy, thorough stir. Followed by a scraped then a bit of time for things to settle and float.
Never do any cleaning in Lee bullet pour pot. Have a separate set up for that.
However I may use wax, after fluxing in my Scrap cleaning pot. To help mix the good stuff, that may have sperated, back together. Before I pour my ingot.
If clean lead is made first into ingots, then put the pot, all you need to do is throw some kind of wax on top to make a kind of seal.
Or if it starts to separate, stir some wax in to make it bind itself back together.
Wax does not remove anything well.
It does two things, seals oxygen from getting in the mix. And removes oxygen while helping to recombine any alloy components that are separated.
Hope this helps someone understand.
Took me a good while to figure it out.