Rather than using chemicals from automatic toilet bowl cleaners (these can degrade the rubber parts and lead to leaks) to clean the rings that form in your toilet, use baking soda instead. This safe method can be done by removing the toilet’s tank cover. Flush. As the tank fills, pour in 1/2 cup of baking soda. Let this sit overnight. In the morning flush. Your tank will now be deodorized and stain-free.This can last several weeks as the residue from the baking soda travels through the system. If you buy your baking soda at the Dollar Store, this is a very economical and safe way to clean your toilet bowl.