Mary Jane wisely asks:

I wanted to present this question out to the experts; What do you think
about the validity of using water soluble flux with BGAs? Do you see a
"residue" issue? Thanks.

Doug Pauls, now way overdosed on Dew, replies:

Maaaaaaaaaaaaaaayyyyyyyyyyybe.
What water soluble flux?
What reflow method?  Vapor phase, IR reflow, laser, hot gas?
What cleaning process?
Adding anything to the water?
In-line or batch cleaning?
Itty bitty BGAs or big-honkin' BGAs??
Full array or perimeter array?
What standoffs?
Are your boards clean going into it?
What do you mean by residue?
What end use environment?
What reliability requirements?
What is the service life of the product?
What are the consequences of failure?
Are you underfilling the BGA?
Why does the other line always move faster?
Is giving a year's supply of Captain Crunch cereal to my nieces a fitting
revenge on my sister?

I should probably stop now.  Too much Dew.  Definitely too much Dew!!

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