One of the easiest ways is to just run the bare boards over a wave with a
flux that is active enough to do what you need to have done. Sometimes just
cleaning in the "right" solution will do it.  Depends on quantity/available
capabilities/how bad the boards are.

"Old" boards may need a bake to get rid of absorbed moisture, and this can
compound the solderability issue. Assess the total issue and make sure that
all the extra effort and potential assembly problems and the reliability
impact against projected life cycle and end product use don't exceed the
cost of scrapping the boards and using new builds.

>Does anyone have any information how to fresh up old PCBs with bad
>solderability?
>Does the board manufacturer do it?
>If yes, how?
>I'm very interested in any kind of detailed information about this
>procedure.
>
>Regards,
>Jan Merstrand
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