Us Pumice Heavy Duty Scouring Stick Pack (Pack of 3)

This worked fine on a needy toilet bowl. I kept it wet as directed, and watched what I was doing. After not too much work the whole bowl looked like new with nary a scratch. I then very carefully worked on a porcelain coated iron sink around its drain and it cleaned up with no damage.

These work pretty well, but ya have to use some good old-fashioned elbow grease to get the job done. I have lots of something in my water that stains toilets quickly, so have to keep up on regular toilet cleaning as well.