Corrosion on copper wiring

Like many on here, my Prius has suffered problems in the wiring due to leaks into the battery compartment and tyre well. Taking apart the connectors, finds that the contacts have turned green and often corroded away. A simple enough fix, but on stripping back the wires, I found that several of the small diameter wires had turned black. Apparently this is due to oxidizing of the copper due to the dampness and can continue along the wires for several inches. Not sure of the long term effect, but I cleaned the ends of the wires the best I could and soldered them together. On researching the problem, I found that if they are dipped in vinegar overnight, they then turn back to bright copper and make a better soldered joint. Too late for my soldering, but I thought to pass on the tip for anyone else undertaking the task.