I have to report the most hilarious thing!
My husband decided to try some of these soda tips . . . and he soaked the toilet bowl in Pepsi overnight . . . oh my gosh, it practically stripped the porcelain right off! It is some crazy stuff! Serious! I've never seen a cleaner toilet bowl in my life!!!!!!!!
Flush, and before the bowl fills with water, dump as much soda in there as you can. Leave it overnight. You'll be amazed - viola!