I am not much of a chemist, but for the copper cleaning from glass, I would probably suggest the idea of finding a soluble salt, and then using the acid based on the oxidizer for this salt.
http://en.wikipedia.org/wiki/Solubility_table
Copper(II) bromide seems soluble.
So what about : http://en.wikipedia.org/wiki/Bromic_acid
Not sure about toxicity of these substances.
