I'm getting ready to start the repair of an old neon artwork that is assembled as a skeleton sign, and I noticed some of the tie wire has a white residue at a few of the contact points where it wraps around the neon tubes. Does this mean the metal of the tie-wire is breaking down? The sign also buzzes loudly from around these areas and gives off an ozone smell. Just curious what is causing this and why it is only happening at some of the tie-wire points and not others. Could the tie-wire be causing the buzzing? Should I switch it out for fresh wire?