old bad brown rust stains – pumice stone will not fit due to size and curve of lower portion of bowl; may have to shut off intake valve to get dry – any suggestions – luckily this is upstairs bowl in master so does not get used by company

This might sound wacky but have you tried alka seltzer?. Drop 2-3 tablets in the water and let it fizz – then let it soak for awhile.
2nd idea- coke- regular coke-

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