Im using Buck Beaver Flux.
It cost few$$ but seams to do a great job.
Let it "Sizzle" and when its done just mix in.
There is no smoke like you get from saw dust and other "burning" material.
http://www.ebay.com/itm/Buck-Beaver-...item4d09f17cec
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"Who was born a Donkey will not die a Horse"
(Unknown author - A fact of life)