I would say you are running a big risk. Why? Imagine your cleaning 
process is good and gives, say, 0.5 µg/cm² eq. NaCl, which you deem by 
qualification to be very good. You then make a few hand solder joints, 
with the flux spread over, say, 1 cm², out of a total of 250 cm² for the 
whole board. Your ionics now read 0.55 µg/cm² eq. NaCl and you say, 
"Whacko! Jolly Good! Eveything in the garden is lovely!" But is it? That 
rise of 0.05 µg/cm² relates to only 1 cm² but is divided by 250 cm², so 
the real contamination level where your hand soldered joints are will be 
  12.5 µg/cm² eq. NaCl. Are you going to sleep so peacefully knowing 
this? I wouldn't! :-(

Brian

Joel Alexander wrote:
> We are processing some assemblies with water soluble flux that requires
> washing.   We then wash the assemblies as required by C-22.  The next step
> we add a some hand soldered parts with no clean VOC flux but do not clean
> the assembly. We sample test the boards for ionic contamination and they
> pass.
> 
> Should these be considered compliant since they pass or would the no-clean
> solder have to also be washed of.
> 
> FYI this is for some military work.
> 
> Any help would be appreciated
> 
> Joel Alexander
> 
> APSCO Quality Assurance Manager
> 
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