Just plain Oatey #5. Never the after rust issues that 'acid flux' (labled as such) has shown me.
I rinse the assembly off lightly when cooled down to rid it of the sticky excess flux left behind. Nothing extensive. Warm water.
Maybe there's less of the so called acid flux in it?. I don't know, I'm not a chemist and don't pretend to be one.
Ammonimum chloride is Salamoniac,,a common at one time soft solder flux itself. But hardly anyone still uses it. Sold in a bar form like a bar of soap.
Works good as a slow rust blue rusting agent as well..that's where I've used most it in the past.
So yes they are rusting agents. Metalic salts are. Potassium chloride (corrosive primers) Sodium Chloride (common salt), Ammonium chloride (salamoniac).
Some more so than others I suspect, some rinse away easier than others maybe too.
The heat used in the soldering process may invite more agressive action of the compounds(s),,another guess on my part.
I do know that once you button up that cavity betw the ribs and the bbl's, it's free to do what it wants to and many I've taken apart because of tell tale lines of live rust at the rib/bbl solder joints showed crusty rusting and deep pitting on the inside from the use of acid flux in soldering that was not completely removed. That inspite of the 'smiths insistance that they in fact did a complete job of removal before sweat soldering. I just don't trust using the stuff. If you get fine results then it's great and chaulk it up to the ' Everyone does things a bit differently and results are what matter'.
I've never had one returned to me for a problem that I've solder/relayed.
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