When I was a kid in the midwest we used Coke to take the rust off chrome bumpers and trim.
Got caught in a short rain shower at night in my bugeye (no windshield washers) and the dirty windshield smeared so badly I could hardly see. Bought a bottle (this was years ago

) of Coke and poured it over the windshield with the wipers on - instant crystal clear.
As far as what Coke does to your stomach, probably nothing - stomach acid's many times stronger than anything in Coke.
Coke will also clear up your plugged nose, even totally eat away your septum with repeated use. But they stopped putting that coke in Coke years ago.