Copper cookware is beautiful but delicate: over time it loses its luster due to oxidation and daily use. The most effective natural method? A do-it-yourself mixture of flour, salt, vinegar and lemon. Just mix them in equal parts and rub gently with a soft sponge. After a quick rinse and wipe dry, they will come back as shiny as when you just bought them. Simple, inexpensive and 100% natural!