Marc,
I will second what Rudy and Leo have said.  In my experience, you want to
either leave the low solids flux residues alone (i.e. totally no-clean) or
fully remove them.  Partial cleaning (or doing a half-ass job of full
cleaning) will get you in lots of trouble.

At Rockwell, we are working on converting to low solids fluxes and pastes,
but still cleaning them.  We still have an RMA and an OA in our inventory,
and until we can weed those out, we need a chemistry that can clean all
three types.  We have found that Kyzen Aquanox SSA in a 28% solution works
very well for all three and we have no problems from residual low solids
flux.  Alpha 2110 also works, but we like the Kyzen materials better.

Doug Pauls
Rockwell Collins

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