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What should be used to clean heavy corrosion off old coins?

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Talk to an appraiser before you clean any coin. You may accidentally lose details that can determine the value of the coin. Sometimes it's the patina of the metal that helps determine the value, so don't clean it off. Never use Coca-Cola, it's an acid and can eat the metal and the patina or tarnish. Some people recommend using a weak solution of bleach or ammonia but I don't know how effective that would be. Again ask before you do anything to the coin, my sister thought she had a funny colored penny, turned out she had a steel penny from WWII which was fairly valuable, if she had cleaned it, or done anythhing to it at all it would have really messed up it's value.

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Ok, thank you. I just can't even read the date, but have already tried coca-cola before I read your post. But I won't do anymore to it.
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I think rubbing alcohol maybe

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I tried that, but so far, coca-cola worked best. Thank you.
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What kind of coins? If they are very valuable, it is best left to the experts to do... if you just want to clean them for your own use, ketchup or Worcestershire sauce clean copper great, and a cut potato dipped in baking soda will clean silver well.

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Wow, thanks. I will try them.
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You're welcome.
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Don't clean them its the worst thing u could do

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Can't even read date on some so must clean them. Thank you.
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Coca cola ..... I'm not even joking it works for pennies if you put one in a cup of coke and let it sit then it gets clean.... It's eather coke or pepsi or maybe both but one really works ....

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Wow, I wonder what this does to my stomach! Coke has worked best with all I have tried. Thank you.
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Boil them in a crick pot

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Thank you.
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What in the world is a "crick pot" ? Curious! :)
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Sure they meant crock pot.
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keep the coins in vinegar for 4-5 days

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Very good idea! Thank you.
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i heard oxy clean

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Ok thank you.
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ur welcome
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Ketchup works.

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Ketchup? Wow! Ok, thanks.
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Tabasco sauce will clean your coins like new... Dab it on little thick and let it set a min. and then wipe off, coins will shine new again and no damage...

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Ok and thank you.
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Lemon juice works I know on copper coins like pennies.. and quickly too. I agree with the other comments though- if they are possibly rarer please talk with a respected coin dealer or auctioneer.

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Good idea, thanks.
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C oke works really good

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Not in this case, it didn't, left it in coke for 2 days! But thanks!
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Don't clean them it devalues them. The best thing you can do is leave it as is. Have it appraised by a dealer or auction house.

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Thanks, you are right, but I had already tried various methods. Thank you.
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diet soda works best

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Will try it. Thanks.
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nail polish removers is suprisingly helpful?

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Wow that's a good suggestion. Thanks.
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For cleaning corrosion from coin just follow these steps:
Firstly, wash coin in cold water, then dip the coin in vinegar for sometime after lightly brush the coin and then again wash with water.

great neck ny flood damage cleanup - http://www.flooddamagecleanuplongisland.com/

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Thank you. I even left this
one coin in a container of vinegar for a full week! Didn't help, even scrubbing it with an old toothbrush. None of the suggestions have really worked. It was badly corroded but I wanted to know the date on it. Still don't know !
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