> I worked in microwave R&D from 1997 to 2003 when I retired.from industry.
> Never saw water flux at any of those companies.
For at least 10 years all the solder wire I've bought for assembly work
has had 'no clean' flux that leaves a tiny transparent residue that can
remain in place - maybe not for high uW or serious QRO, but for all
normal soldering it's fine. I have a bottle of old Kester flux if I need
to tin rusty iron or tarnished copper.
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