>I throw my completed and tested new boards straight into the
>ultrasonic bath, with plain water. I usually leave then there for 30
>seconds.
>
>It removes any and all flux, even the flux left residue underneath the
>chips (on smt packages). It works great to remove the flus, even if
>the flux is not the water soluble type.
>
>It sure beats the heck out of drowning the board with toxic and
>expensive flux remover::>

However ultrasonic baths are also a known destroyer of chips. What appears 
to happen is that the ultrasonic vibration seems to shake bond wires off 
chips.

I know that ultrasonic cleaning is banned for anything we fly in space 
because of known problems induced by ultrasonic cleaning. 

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