I find it more amusing that the coupon code (listed right there) is SPRUCEUP40
I rushed in to tell you to use a BLACK pumice stone, like this:
Do not use the one that looks like a rock. It will scratch your toilet.
The black one is soft and will work like an eraser. It will also dissolve in your hand as you erase the stain. You will need a couple. You can get them in local drugstores for a lot cheaper than my online link. Cheaper as in around $1.49 each.
My brother and I bought an investment property in FL and the toilet there was 20x worse than this. 6 hours of hard work later, after trying everything else from the grocery store and hardware store with only marginal improvement, I was ready to replace the toilet when someone suggested pumice. It erased the stain like chalk on a blackboard.
Neat. Thanks.
Pumice stone abrasively removes ALL stains that are on the porcelain surface. Hard water stains, dried paint spots, anything. Magic Eraser is a sponge and will not clean your toilet. Use pumice.