To de-fur a kettle I have used Phosphoric Acid. I've seen this acid refered
to as "A Food Acid" as it is contained in Coca Cola. Coca Cola is food?????
Never mind.

You could even try a litre of Coca Cola in a dry toilet bowl, it is cheap
enough.

Phophoric Acid is also a good rust remover. I saw a formula made of...
50% Phosphoric Acid.
50% Acetone.
A squirt of Fairy Liquid to act as a surfactant.

Chris.


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