Personally I wouldn’t use any abrasive product or any grade of steel wool except for Big 45 Frontier Pads.
A sonic cleaning tank is best for loosening that crud and “tarnish” (patina) along with a solvent for that purpose. I’ve asked my daughtar if I may borrow back my sonic cleaning tank soon... she borrowed it a year ago to clean some jewelry.
When she gets it back to me I have a couple of frames to clean.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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