Boiling water is good for removing corrosion products if you have the contact remote from everything. The heat causes the contact to dry off.
Its also good for battery terminals.
By dissolving the corrosion only, you dont damage the metal.
I have been told a product like "Tarn off" will do this also. Its used for restoration of silver etc. I havent used it though.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving