A highly abrasive polish may be too harsh for delicate items ... mix equal parts of baking soda and water to form a paste. Apply the paste to the copper surface and let it sit for 15-20 minutes.
Thanks to its slightly abrasive texture, it can scrub grime and polish surfaces without much risk of scratches ... To achieve a smooth consistency, you'll need to warm the solution so the cornstarch ...
It has a lot of potential to make a mess, though, and the polishing ball will really spray compound around if you ... you use a mildly abrasive cleaning pad to haze the headlight evenly, clean ...