Using cola or soda for different purposes

I am not sure if all of these would work as I haven't tried them yet so take it with a grain of salt. It's kind of amazing though if it's real and you can do all of these. The way you can clean the rust off the metal is something I am skeptical about though. Although, to be fair, if the rust is only on the surface and hasn't seeped deep down the metal, then it can still be removed.