I had an old container of peroxide that was almost full, so I poured it into the toilet bowl, getting it on the sides, above the water, too. I don't know what made me do that, but my toilet looked so clean you'd think it was brand new, and it was over 20 years old, at the time. I think it helps that I don't use abrasive cleaners, so the surface is not all scratched up.
I had an old container of peroxide that was almost full, so I poured it into the toilet bowl, getting it on the sides, above the water, too. I don't know what made me do that, but my toilet looked so clean you'd think it was brand new, and it was over 20 years old, at the time. I think it helps that I don't use abrasive cleaners, so the surface is not all scratched up.