How to Clean Copper: A Simple Step-by-Step Guide

What You’ll Need

Lemon juice or white vinegar
Salt (table or kosher)
Soft cloths (microfiber or cotton)
Baking soda (optional, for heavy tarnish)
Dish soap and warm water
Soft-bristled brush (old toothbrush works)
Olive oil or mineral oil (for polishing)

Step-by-Step

Prepare the surface. Remove any dirt or grease by washing the copper item in warm water with a few drops of dish soap. Rinse thoroughly and dry with a soft cloth.
Make a cleaning paste. In a small bowl, mix equal parts salt and lemon juice or vinegar. Stir until the salt is mostly dissolved. For a thicker paste, add a little flour to make it spreadable.
Apply the paste. Using a soft cloth or your fingers, apply the paste generously over the tarnished areas. Rub gently in circular motions. You should see the tarnish lift off onto the cloth.
Let it sit (if needed). For stubborn spots, leave the paste on for 5–10 minutes. Do not let it dry completely, as this can leave streaks.
Rinse and dry. Rinse the copper under warm water to remove all paste. Dry immediately with a clean, soft cloth to prevent water spots.
Buff to a shine. Once dry, polish with a dry microfiber cloth using small circular strokes. For extra luster, apply a tiny drop of olive oil to a cloth and buff, then wipe off any excess.

Common Mistakes

Using abrasive scrubbers. Steel wool or scouring pads scratch the copper surface. Stick to soft cloths or a soft-bristled brush.
Leaving paste on too long. Acid can etch the metal if left for more than 15 minutes. Always rinse promptly.
Skipping the rinse. Any residual salt or acid will cause new tarnish quickly. Rinse thoroughly and dry completely.
Using too much oil. Excess oil attracts dust and leaves a sticky film. Use a drop, then wipe off all visible oil.
Cleaning lacquered copper with acid. If your copper has a clear protective coating, acid can damage it. Test a hidden spot first.

Tips

For heavily tarnished pieces, make a paste of baking soda and lemon juice instead. It’s slightly more abrasive but still gentle.
To prevent tarnish, apply a thin layer of clear lacquer or wax after cleaning (if the item is decorative, not for food).
Store copper in a dry place, wrapped in acid-free tissue paper to slow tarnishing.
For copper cookware, avoid using lemon or vinegar if the pan has a tin lining; use a gentle copper cleaner instead.
Always test any cleaning method on a small, inconspicuous area first.

Troubleshooting

Paste didn’t remove tarnish. The mixture may be too weak. Increase the salt ratio, or let it sit longer (but not over 15 minutes). For very stubborn tarnish, use a commercial copper cleaner.
White spots after drying. These are mineral deposits from hard water. Wipe with a cloth dipped in vinegar, then rinse with distilled water and dry.
Streaks or smudges. You likely left too much oil or paste residue. Wash with soap and water, dry, and buff with a clean cloth.
Copper turned darker after cleaning. This can happen if the acid was left on too long or if the metal wasn’t dried fast enough. Re-clean with a fresh paste, then dry immediately.
Lacquer is peeling. If you cleaned a lacquered piece and the coating is coming off, you’ll need to remove the rest with acetone or a commercial lacquer remover, then either re-lacquer or keep it bare.

Frequently Asked Questions

Can I use ketchup to clean copper?

Yes, ketchup contains vinegar and salt, so it works as a mild acid cleaner. Apply a thin layer, let sit for a few minutes, then rub and rinse.

Does copper tarnish faster after cleaning?

No, but without a protective coating, it will tarnish again at the same rate as before. Applying a thin layer of oil or wax can slow this down.

Is it safe to clean copper cookware with lemon?

For bare copper, yes. But if the pan has a tin lining, avoid acid on the lining. Clean only the exterior copper with acid, and use gentle soap for the interior.

How often should I clean copper?

Depends on use and exposure to air. Decorative pieces may need cleaning every few months; cookware might need it weekly if used often. Wipe down regularly to reduce buildup.

Can I use toothpaste to polish copper?

Toothpaste is mildly abrasive and can work in a pinch. Apply a small amount, rub gently, then rinse thoroughly.

Will vinegar damage copper?

Vinegar is acidic but safe for copper when used briefly and rinsed off. Prolonged exposure can etch the metal, so always rinse well.

Sources: Copper Development Association. Menus and buttons can differ slightly by version. Spotted something out of date? Tell us.