Chemical free trick to clean that nasty toilet bowl ring.
After attempting to clean with Comet and Liquid toilet bowl cleaner I still had this nasty hard water build up scuzzy ring.
The lemon Koolaid works in the dishwasher too for removing the soap scum build up from the insides. Just put in in place of the soap and run an empty washer on it's regular cycle. The before and after will amaze you!