How do I remove this in my toilet?

Have you tried Clorox ..pour some in let stand a couple of hours ... hope this works for you ...it worked in mine

Get a scouring stick, which is a pumice stone for toilets. Drain the water from the bowl, use Lysol toilet cleaner (in black squirt bottle) and scrub.

Comet cleanser and green scrubber sponge

Thanks everyone! I love this web site!

you scratched your toilet with the snake ,ketchup,or cola let set than flush ,or lime away

After draining bowl I would try Magic Eraser or an acidic toilet bowel cleaning product by ZEP only found at Home Depot.

CLR (calcium, lime and rust remover) worked for me. You can buy it at Wal-mart.

Drain water, put comet in bowl and scrub with brush....Comesright off

Pour bleach in there, let sit and flush.

I used Whink Rust Remover for this problem. Rust hasn't come back. Drain bowl, wipe dry, then drizzle on and wipe off. Find at Menards, etc.

After draining the bowl, I prefer "Soft Scrub with bleach" on rust stains on fine finishes - doesn't scratch and cleans very well. Second choice is "Bon Ami, 'Hasn't scratched yet' ", mixed with a good liquid dish detergent.

Try denture cleaning tablets. Let sit for a while and flush.

Looks as if the porcelain is scratched. Try using Bon Ami powder. Worked for me though there weren't as many scratches. Even if it doesn't remove all the scratches it is gentle enough not to damage it further.

It looks as if the snake scratched the enamel or 'painted' coating off the toilet. Unfortunately cleaners will not repair the damage. Either re-enamel, 'paint' or replace ther toilet.

Yup switch water off. Wait and then paint with enamel bathtub paint..

You can either use clorox or paint it once when draining the water

Here's a post that might help https://www.carterservices.com/blog/2020/june/tips-for-removing-hard-water-stains-in-your-toil/#:~:text=First%2C%20flush%20the%20toilet%20and,a%20fresh%2C%20and%20clean%20bowl.