Most likely, the tarnish does not extend too deeply into the coils
on the spool. If you have access to an ionic cleaner (SpeedBrite is a
brand), give it a try. When the tarnish is removed, the metal’s
surface might be slightly less shiny. In that case, after you cut
your 6 ft. lengths, a couple swipes down the length of wire with a
polishing cloth should restore the shine.
Hope this helped, Judy in Kansas, where today is SUPPOSED to be the
last with temps over 100F!!! I’m ready for fall.