I'm almost embarrassed to ask this one.
          
          Green Cu oxide shows up on socket pins after about three 
          months in the field.  Very little shows up before assembly, 
          or shipment.
          
          Is this as simple as the wash not being monitored properly?
          
          I'll listen to anything as technical as anyone wants to get 
          from proper p.c. fab methods to the chemistry behind it.
          
          Thanks in advance.