Anybody ever tried this to be true?

To remove rust spots from chrome car bumpers:
Rub the bumper with a crumpled-up piece of aluminum foil dipped in Coca-Cola.
Apparently much more economical than the stuff from Smart Shop.

I wonder whether it's the aluminium foil doing the trick rather than the cola.

Another Cola wonder:
To clean a toilet:-
Pour a can of Coca-Cola into the toilet bowl. Let the "real thing" sit for one hour, then flush clean. The citric acid in Coke removes stains from vitreous china. No scrubbing, no sweat - guaranteed.