Tim Wescott wrote:
Oops.

After finishing soldering my Very First model airplane fuel tank, I
went to do the last step of any soldering project -- cleaning off the
flux.
Unfortunately, while I know that the flux I use yields to scrubbing
with hot soapy water, I don't know what -- if anything -- will just
take it off. I'm experimenting.

I usually have good results with Berryman B-12 Chemtool for defluxing.

Jon