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Nearly all carbonated soft drinks contain carbonic acid, which is moderately useful for tasks such as removing stains and dissolving rust deposits
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For the record, ALL carbonated beverages contain carbonic acid, because that's what makes them Carbonated. Dissolve CO2 in water and you get Carbonic acid. Pressure keeps it in there, so when you release the pressure opening the can, thats why all those bubbles appear, its the Carbonic acid returning to CO2. After the initial fizz it takes time for it all to get out of there, making the beverage "flat".