The Natural Philosopher wrote:
Chris Styles wrote:

All,

We've just moved to an area with very hardwater, and I dont think the
previous occupants did anything to compbat limescale in the loo :-(
Despite scrubbing and using a few of the off-the-shelf-from-teso
limescale removers, the deposits havent budged.


Google seems to suggest using vinegar - anyone got any experience of
this? Alternatively, can anyone recommend some super
industrial-strength limescale eater?


BRICK ACID.

Cheers

Chris

I find it best to block the WC with a plastic bag and fill the bowl
right up to the rim with 5-10% sulfamic acid crystals (Fernox descaler).
Leave overnight. Best way I know to get the whole thing clean with the
minimum of effort. Anyone who wants to mess with hydrochloric is welcome.
================================================== ========
Sulfamic acid is a dry, non-volatile, non-hygroscopic, odorless, white
crystalline, stable solid acid. It is moderately soluble in water by
forms strongly acidic aqueous solution that is comparable in acidity to
the common strong mineral acids but may be easily handled and stored in
the dry form. At room temperature, dilute aqueous sulfamic acid solution
is stable for a long time but rapid hydrolysis occurs at elevated
temperatures. Its solution is less corrosive towards metals than other
mineral acids. Salts of sulfamic acid are very soluble in water. Because
of advantages such as handling ease, solubility and low corrosiveness,
sulfamic acid has many diversified uses.
================================================== =============