Copper and brass aren’t produced locally but if we own copper or brass objects it is great to be able to clean them easily with this simple product:
Tomato sauce.
Put on a healthy dollop and spread it across the item. Leave for a while (an hour say) then wash off in water.
I was very pleased at how it removed a huge amount of grime that would have been hard to get rid of with traditional products. I finished off by polishing with Dubbin to protect it.