1. Clean Toilet Bowls:
To clean hard water stains from your toilet bowl, pour a little Coke into a spray bottle and spray the rings thoroughly. Let the Coke sit for about an hour in the toilet bowl. For stubborn stains, use a toilet brush. For extra tough stains, let the Coke sit overnight. Flush the toilet and see the wondrous work of the phosphoric acid.
9 Surprising Ways to Put Coke to Work in Your Home: Just More Reasons Not to Drink it