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Coke also works good to free rusted pistons in Harley-Davidson motorcycles....Dump a bottle of coke in each cylinder, wait 12 hours, and the pistons practically fall out.

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If you look at the ingredients in Coca-Cola, you will see that it contains phosphoric acid. Very diluted of course, Coca Cola being mostly water. "Generic" sodas used to be called "Phosphates" at soda fountains, as in "I'd like a Cherry Phosphate".

Phosphoric Acid reacts with rust; if there is enough phosphoric acid to make the reaction complete, all the rust is depleted.

Phosphoric acid + rust -> iron phosphate + water

Iron phospate does *not* react with water. It is very inert, & many folks think of it as a primer-type substance (if you sand the excess powdery amount away), it does hold most paints well.

You can do better than coke by just buying phosporic acid at Home Depot or wherever; it generally goes by names like Ospho or Ph-Ospho-Ric.

It's an indespensable repair/restoration tool. And it doesn't contain all the sugars that Coke has, which cause problems of their own!

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