There's nothing better than Maas copper polish for polishing copper. Available here in a handy, 2-ounce tube for those who desire a bright, shiny finish for their rain gauge. Just a dab will remove years of rust, tarnish and yuck from all kinds of metal, enamel, plexiglass, resin and glass. It ships for free a smells like French Lavender. What more can you want?

Really into the shiny thing? Consider using a metal protectant after you polish.