A Google search reveals that Lime-A-Way is phosphoric acid, which
incidentally is also an ingredient in the soft drink, Coke. It would
be a sort of pickle on copper.
Some years ago an Orchidian revealed that Coke was effective in rust
removal from steel tools. I’ve used that tip several times on rusted
drawer pulls, casters, and other antique furniture components.
Hmmm… I think I’ll try Lime-A-Way on a rusted item and see how it
Judy in Kansas, where we have had a gentle lovely spring, but things
are heating up and it’s nearly time to sweat!! However, the walleye
are biting, so all is right with the world!