Most likely Citrus such as lemon or orange.
apple juice... I did that as a science fair project
I think coca cola cleans pennies the best
it cleans them
Probably some student's science fair blog. Search it on Google. Frankly, I don't think any serious research has been done on that topic.
Vinegar.
There are a number of different projects a student can do for the science fair. Some classics include building a working volcano or growing a potato hydroponically. For other ideas, a simple internet search should yield useful results.
vinegar
lemon juice cleans a penny better
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vinigar and baking soda can wash pennies or any coin. put it in a jar, and put a cup of each then shake, shake, shake! it should come out clean!
no. The thing that cleans pennies the best is chicken broth! imagine that!
no such thing as cleaner