Hello Kamalesh,
If you are with TRW in San Diego or Marshall, IL, you are using a Smart
Sonic Ultrasonic Stencil Cleaner and 440-R SMT Detergent for cleaning
stencils.  This same system and chemistry may be used for cleaning
misprinted PCBs.

Orient the paste side of the PCB downward so the solder paste can fall
freely away from the PCB and not contaminate side "A".  Because there are
no sprays or recirculating water, the chance of contaminating the populated
side with solder balls is very small. Gravity works with you.

Spray systems should not be used because the sprays will broadcast the
solder balls throughout the cleaning chamber and contaminate the populated
side.  There is an article by Richard Clouthier on the Smart Sonic Web Site
that describes using spray cleaners for cleaning misprinted PCBs as
a "Solder Ball Nightmare."  www.smartsonic.com

Regards,
Bill Schreiber

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