how pure does it have to be? I was up irrigating and ran into a beekeeper. He runs his honey combs through a centrifugal force seperator and some of it comes out pretty clean an some not so. Told me to give him a call in July and he would give me some. How clean does it have to be for fluxing lead and making lube? Does anyone know how to clean it up to make pure? Thanks,Mac.