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How do you conserve rusty iron coins?

I have many pieces of rusty iron notgeld and I was wondering what I can do to make them look a little better. -Dan
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Sorry. I couldn't resist.
Well actually, I could, but I chose not to.
"Cleaning and Preservation of Coins and Medals"
Sanford J. Durst
Numismatic Publications
Rockville Centre
11 Clinton Av
NY 11570
10th printing, 2001
Among lots of others, your iron "notgeld" is mentioned here.
Chinese Silver Coins
Chopmarks
Coca-Cola has phosphoric acid in it ( and we drink it). This is the same chemical as in Nicalene that I have used on crusty nickels. Cemetarys sell it so you can clean the oxidation off of your loved ones Bronze head pieces. Seems it would work on the iron pieces as well.
Krueger