4 best toilet bowl cleaners, according to our testing
Amazon.com: Simple Life Automatic Toilet Bowl Cleaner | Long-Lasting Toilet Cleaner Tablets in Bottle | Septic Safe Toilet Tank Tablet Drop Ins | Clean and Prevent Stain Build Up | 3 Count :
In-tank toilet cleaning tablet - Wikipedia
Clorox Ultra Clean Toilet Tablets with Bleach 4-Count Toilet Bowl Cleaner in the Toilet Bowl Cleaners department at Lowes.com
Automatic Toilet Bowl Cleaners May Not Be As Safe As You Think