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Toilet bowl rim: Unblock mineral deposits inside holes [duplicate]

Possible Duplicate: Why do my toilets flush slowly and often incompletely? Yep - got an old toilet, and the mineral scale inside (INSIDE inside) the rim is slowing the flush speed. I ...
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1answer
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What is the white, crusty, crumbly stuff I find in my kitcken sink drain pipes?

From time to time my kitchen sink needs to be unplugged, and each time I invariably find accumulations of a crusty, crumbly white material in the pipes. It looks a lot like old cheese, has no ...