Best way to clean this circuit board?

Another comment about the harness connector pins. Mine on my 67 were "devastated." Several were loose and VERY corroded, and several broken. It was a mess. SO I simply soldered small pigtails on the board traces near the pins (scraped through the blue/ green coating, scraped the copper clean) and abandoned the original harness connector. We to RadShack and bought 2 pairs (4 halves) of mating "Molex" style connectors, and configured them so they can not be mis -mated. Mine no longer has most of the stock harness, anyhow.