On 2013-04-08, Danny D. wrote:
On Mon, 08 Apr 2013 15:56:50 +0000 notbob wrote:

Over time, this has caused heavy brown deposits (lime?)
in the bottom of our porcelain crapper.

I'm pretty sure it's a calcium deposit, like lime. It's rough and
porous, where rust stains are usually only color stains.

The bleach did not work.

Hmmm.... I've found bleach will do well in eliminating the color and
leave the porcelain white, but not remove the porous deposits.


My sister said she had scrubbed already, so I didn't even try to
scrub them. I'm hoping the phosphoric acid, left on for an hour or
two, will have done the trick by the time I return.

Let me know how it works. I've got some Polident doing its thing, now.

nb