I've tried soap and it didn't work very well. The two best fluxes I've found are sawdust, and lard (or Crisco). Used motor oil works but is too flammable.
If you have a chainsaw or a jointer, you can make a lot of sawdust in a hurry.
I use a tiny dab of high temperature lithium complex grease on a Qtip to lube mold alignment pins and the sprue-cutter pivots.
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