Look carefully at many stained glass windows and you can see that there corrosion is on the edge of the soldered lead line. This leads us to believe that most corrosion is caused by flux or patina which slowly leaks out from under the lead over time.
There are likely other causes of corrosion. Salt water in the air near the ocean may be a cause and there may even be some type of mold that can form on lead, but this fix will work on all of those causes.
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