How to remove water mark line from inside toilet bowl?

I got the same problem. I used a bleach cleaners and scrubbed , then I had to fill up the toilet with water past the water line and let it soak in the bleach cleaner. Good luck! I have to keep eye on it and clean it weekly

Get CLR remover...works great. CLR is Calcium/Lime/Rust remover.

We use a pumice stone and scrub it.

I pour some vinegar in the toilet. A few squirts of Dawn dish liquid. Swish around with a toilet brush to foam it up. Let it sit for about an hour or two. Then swish around with the toilet brush again. The suds suspend the vinegar above the water line.

CLR will do the trick.

Hello, the works is a great product but buy the regular not the basic. I have not found anything that it cannot get out.