In article , David Billington
says...

I have been using some SS/tooltip brazing flux which works fine for the
item, the trouble is it forms a very tenacious glassy residue. I have
been boiling it and a couple of hours seems to remove the flux residue
fairly well ...

Boiling water. The first thing I do when I go to silver braze
an item is to 'put the water on for tea...'

Jim


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