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Old 11-19-2020, 06:06 PM   #3
Lawson Cox
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Join Date: May 2010
Location: Above the gnat line in Georgia
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Default Re: External green radiator corrosion

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Oxidation. I sort of agree with Alan if it is in a car. I have a NOS core that is almost completely covered with greenish/gray oxidation. Spray it with vinegar and see what happens.
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