I have a ring around my toilet bowl, right where the water is at its highest level, like a water build up, the ring has a rough texture. How do I get it off?

CLR or toilet bowl cleaner. Probably will need to let it soak and reapply if necessary. This took a long time to build up, use these products regularly and theywill stop the build up and be easioer to use

If toilet bowl cleaner doesn't get it try soaking one of those 3 M scratchy pads in oven cleaner and scrubbing the buildup off, Good luck, Tom