You may have seen the Pin claiming that a simple soak with Coke will take away all your toilet ring blues. Well, I decided to give the beverage a shot and glug, glug, glug, into the bowl it went. After a few hours of soaking, some scrubbing with a toilet brush, and a couple of flushes, I am sad to report that the ring (which was not too bad to begin with) got WORSE! Argh! The brown color of the soda seemed to make the ring darker.
I wouldn't give this one a shot if I were you. I'd consider this myth busted. Back to bleach for my toilet cleaning needs.