It's soluble in alcohol, so I guess you could dissolve it in alcohol, filter it, then evaporate the alcohol. Kind of expensive unless you're just doing a small amount.
I "grade" my scrapings, saving them in one of two or three separate bags, and use the highest grade for myself (e.g. propolys tincture, etc.).
The best way to go would be to buy plastic propolis traps that keep most of the junk from getting mixed in with the propolis in the first place.
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"If it ain't broke, I'll break it!"
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