clean coins

Can citrus fruits such as a lemon or a orange clean dirty coins,and if so how?

I’m doing a school science project and I need more info. on how a citrus fruit such as a orange,lemon,lime, and a grapefruit can clean dirty coins. I would like to know why, and what is it that works as a cleaning aid.

citiric acid ( hence the name)…its an organic acid ( ie comes from something living) but I think its do with the acid ( its a weak acid) reacting with the oxidised layer on the coin to make them shiny again. The oxidised layer should be METAL ( whatever the metal is in the coin) oxide and a metal oxide+acid –> hmm thinking hmm maybe hydrogen gas and a salt and leaving metal clear.

I am pretty sure that carbonated drinks have carbonic acid ( form the carbon dioxide dissolving in the water) among other things…maybe added citric acid??

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Metal Detecting Cleaning coins 2009