Don’t reach for tarnish remover [1] to polish up your copper-bottomed pans -- make your own with this recipe! Cut a fresh lemon in half and sprinkle salt on it. Using the lemon, rub the salt into the copper and you’ll be amazed how fast the tarnish melts away.
Links:
[1] http://www.moneypit.com/product-reviews/tarn-x-tarnish-remover-gives-instant-shine