Preparation of oxidation electronic component leads for solderability

organic acids, like oleic can do this at 80C or so.

You will need to dip, heat and solvent wash the parts and be prepared to condense any fumes. Normal production with these agents has been phased out.

Another way is an ultrasonic bath with pumice which will erode the oxides.

some other stuff in here.

http://www.google.ca/search?hl=en&q=%22cleaning+electronic+parts%22+%2Bsolder&btnG=Search&meta=

Thanks! That is really useful info. I have passed along internally. Gratefully, Ron