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how to clean pennies

Cleaning pennies is easy, but the method depends on whether they are just pocket change or collectible coins you want to protect. For valuable or old coins, the safest answer is: do not clean them at all, as cleaning can permanently reduce their value.

Quick Scoop

  • For regular, dirty pennies: a mild vinegar-and-salt bath or dish soap and water works well.
  • For collectible coins: leave them as they are; even “gentle” cleaning can scratch or strip the surface and hurt value.
  • Always rinse and dry thoroughly so no cleaner stays on the metal and causes green corrosion later.

Best simple method (everyday pennies)

Vinegar and salt (classic kitchen method)

  1. Put a handful of pennies in a glass or plastic bowl.
  2. Add white vinegar until they are just covered.
  3. Stir in regular table salt and dissolve it (a spoonful or so).
  4. Let the pennies sit 30 seconds to a couple of minutes, flipping them once.
  5. Take them out, gently rub with your fingers or a soft toothbrush if needed.
  6. Rinse very well with warm water and dry with a soft towel.

Why it works:

  • The acid in the vinegar loosens the dull oxide layer on copper.
  • The chloride from the salt helps dissolve and lift off the tarnish, revealing brighter metal underneath.

Safety and damage control

  • Do not leave pennies in acid for a long time; it can over-etch the surface and create an ugly green coating of copper salts.
  • Use a soft toothbrush only; hard scrubbing can leave visible scratches.
  • Always rinse off the acid completely so it does not keep reacting on the coin.

Other fun household options

These are fine for coins that are not rare and are just for crafts or looks:

  • Lemon or lime juice : Similar to vinegar, slightly stronger acid; short soak, gentle rub, rinse and dry.
  • Ketchup : Spread a thin layer on the penny, wait a minute or two, then rub, rinse, and dry. The tomato acid plus salt brightens the copper.
  • Cola or other acidic drinks : Soak briefly; they can clean but are sticky, so rinse very well afterward.
  • Mild soap and water : Good if the goal is only to remove dirt, not tarnish. Use warm water and a drop of dish soap, then rinse and dry.

For large batches of filthy, non-valuable coins, some hobbyists mention rock tumblers with water, a bit of detergent, and grit just to get them clean enough for coin-counting machines, not for collecting.

When not to clean pennies

Collectors and coin forums repeat one theme: if a coin might have collector value, do not clean it.

  • Cleaning can:
    • Remove original surface and patina that collectors pay for.
    • Leave hairline scratches or a “polished” look that lowers grade.
    • Turn a potentially valuable coin into one that is worth only face value.
  • In coin-collecting communities, “harshly cleaned” is usually a negative mark on a coin’s condition.

If you suspect a penny is rare (old wheat cent, error coin, unusual mint mark), the safest move is to leave it as is and show it to a coin dealer before doing anything.

SEO-style extras (for your post)

If you are writing about how to clean pennies as a trending or informational topic, you can highlight:

  • The science angle: simple kitchen experiment for kids showing chemical reactions between acid, salt, and copper oxide.
  • The collector angle: why modern forums and hobbyists warn against cleaning any coin with potential value, which often shows up in recent discussions.
  • The practical angle: cleaning “coin-star” change versus preserving older or unusual pennies.

Information gathered from public forums or data available on the internet and portrayed here.