In the vast majority of cases, no. Cleaning a coin—even with mild household cleaners—almost always strips away its natural patina, alters the mint luster, and leaves microscopic scratches (hairlines). This permanently destroys collectible value.
Collectors hate cleaned coins because the process strips away a coin's natural "patina" and often leaves microscopic, irreparable scratches (known as "hairlines"). Cleaning destroys the coin's historical integrity and original mint luster, which causes its numismatic value to drop significantly.
To clean a coin without ruining its value, the safest and only universally accepted method is soaking it in pure acetone or distilled water. Never scrub, rub, or use abrasives like baking soda or toothpaste, as these leave micro-scratches that permanently destroy collector value.
No, you should never clean old or collectible coins before having them appraised. Cleaning a coin usually reduces its value by 20% to 50% and can sometimes strip away almost all of its collector's premium.
Key Takeaways: Never clean your coins. Cleaning almost always decreases value by removing historical patina and causing invisible damage. Patina and “grunginess” are good.
Yes, Dawn dish soap is an excellent, safe choice for cleaning coins. It is highly effective at cutting through grime, oils, and dirt without the harsh chemicals that can strip a coin's natural patina or damage its surface.
The 1894-S Barber Dime is the most famous dime worth over $1,000,000. Only 24 were originally struck to balance mint accounting books, and just 9 examples are known to exist today. Authenticated specimens consistently sell at auction for between $1 million and nearly $2 million.
Yes, Coca-Cola will clean old coins because it contains phosphoric acid, which reacts with the oxide and tarnish layers to dissolve grime and rust. However, it is highly discouraged because it can strip away a coin's natural patina, leave an unnatural tint, or cause permanent surface damage that ruins its collectible value.
Pre-1964 U.S. dimes, quarters, and half-dollars contain 90% silver. Their value fluctuates with the global silver spot price but generally hovers around $20 to $23 times their face value. For example, a single 1964 silver quarter (face value: $0.25) has a base melt value of roughly $5.50 to $6.00.
The "hardest" coin to find depends on whether you mean a legendary, one-of-a-kind treasure or a highly sought-after, elusive coin still hiding in everyday pocket change.
Never clean collectible coins, as it permanently strips their value and natural patina. If you must remove loose dirt from common coins, avoid anything that strips metal, reacts chemically, or scratches the surface.
The coin is dipped into a dilute acid solution that removes the oxidation from the coin along with a small amount of metal. Overdipped coins result in loss of luster which lowers the coin's grade and appeal. According to author Thomas E. Hudgeons Jr., this is the safest way commonly found coins are cleaned.
For cleaning common pocket change the absolute fastest method is a 5-minute soak in a mixture of distilled white vinegar and table salt. This acidic solution immediately dissolves the copper oxides (tarnish). Warning: This will permanently strip the patina, so never use this method on valuable or collectible coins.
Professionals strictly avoid abrasive scrubbing and harsh chemical dips, as these permanently strip the coin's natural luster and reduce its value. Instead, experts use non-invasive methods like soaking in 100% pure acetone to dissolve organic residues, or gently using distilled water and ultrasonic baths for loose dirt.
While standard 1984 Australian $1 coins are very common, highly sought-after specimens are valuable due to rare striking errors and specific manufacturing varieties.
Never use these cleaners on a coin
Abrasives are all bad all of the time. That means toothpaste, baking soda derived cleaners and most proprietary metal polishes should be avoided. Acid is bad. Vinegar, lemon juice, ketchup, cola… don't use them.
A 1964-D Kennedy half dollar is worth between $27.50 and $40.00 on average. Because it is struck in 90% silver, its minimum value is dictated by the silver melt price, which is roughly $27.34. Uncirculated and professionally graded coins can reach into the hundreds or thousands.
A standard full roll of 40 pre-1965 quarters (a $10 face value) is currently worth between $𝟓𝟑𝟎 and $𝟓𝟕𝟎. This price fluctuates daily, as the value is primarily based on the current live melt value of the 90% silver content rather than the coins' rarity.
The 1972 Eisenhower ("Ike") dollar can be highly valuable due to a specific minting error (the "Type 2" reverse) and genuine 40% silver collector editions. While standard, circulated copper-nickel versions are only worth face value, rare varieties can sell for hundreds or thousands of dollars to numismatists.
Yes, hydrogen peroxide cleans coins by lifting dirt, grease, and green tarnish (verdigris) off the surface without causing abrasive scratching. It is a safe and highly effective way to sanitize circulated or buried coins.
Yes, it is almost universally better to leave old, collectible, or rare coins uncleaned. Cleaning them—especially with abrasive polishes or chemical dips—can destroy their natural toning, strip away the protective patina, and cause microscopic scratches. This permanently ruins their "eye appeal" and historical value, often reducing their resale price significantly.
Baking soda is great at getting into all of those small spots where dirt and grime can be hard to remove — you can use it alone or by mixing a bit of water with it to make a paste. Once you have the baking soda on the coin, you can rub it onto the coin and rinse.
To make it easy to spot hidden value, you should always keep all dimes dated 1964 or earlier, as they contain 90% silver and carry a high precious metal value. For more modern circulation finds, look out for specific key dates, missing mint marks, and rare printing errors.
A common date Morgan Silver Dollar contains 0.77340.77340.7734 troy ounces of pure silver. Its minimum scrap (or "melt") value is calculated by multiplying this fixed weight by the current live silver spot price.