Probably

[rgilbert]

The steel wool and elbow grease will probably work as long as you get the copper nice and shiny and free of oils. But the problem is that you cannot see with the naked eye whatever oils are left. Oils will prevent the Super Spray or Spray A from adhering to the copper and allow the copper to come in contact with the glass and react to it.

I work mostly with foils and small bits of wire so pickling is far more time-effective than scrubbing.

Roxane