It’s good to know how to clean sponges because they can get really gross really quickly.
Copper pots and pans are wonderful for cooking, but over time they can develop tarnish. While tarnish doesn’t affect their performance, it’s not pretty. It’s worth mentioning that the tarnish patina actually protects the copper from corrosion. If you can live with the look of the tarnish, you may want to just leave it alone