use a pumice stone. It doesn't harm the porcelain. To prevent the ring, get KABOOM Scrub Free Toilet Cleaner. It installs in the back of the tank and cleans with every flush. My previous house had 4 toilets and I had them in each one. Seldom had to scrub a ring in 13 years, usually in one of the seldom used toilets.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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pour baking soda followed by white vinegar then use a pumice stone
Borax and Vinegar
Finish by scrubbing the bowl with a toilet brush to remove hard water stains.
Try Coca cola
If cleaners don't work you can always use a pumice stone, awesome good!
Try baking soda and white vinegar let it sit for a least an hour also I have used efferdent yes denture tabs you can check out this site for more ideas https://www.wikihow.com/Clean-a-Ring-in-Toilet-Bowl
If the ring is calcified material, a pumice stone might be your only option. It is amazing how they work but do not seem to scratch the porcelain.
use a pumice stone. It doesn't harm the porcelain. To prevent the ring, get KABOOM Scrub Free Toilet Cleaner. It installs in the back of the tank and cleans with every flush. My previous house had 4 toilets and I had them in each one. Seldom had to scrub a ring in 13 years, usually in one of the seldom used toilets.