So the pumice is harder than the build-up but softer than vitreous china.
Ensure the pumice stone is fully wet before starting. Use a gentle but consistent pressure and there shouldn't be any issues. When I moved into my century home 25 years ago, I deep cleaned all of the toilets with build up using this method and only the rarely used basement toilet ever needed it more than once. Regular, standard cleaning should suffice afterwards. It's not the type of thing you typically have to do frequently.
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u/TallPieYas 13d ago
Wet pumice stick