On Wed, 26 Jul 2017 19:49:41 -0600, rbowman
wrote:

On 07/26/2017 02:17 PM, Wayne Boatwright wrote:
We havea tried CLR, chlorine bleach, and a host of other toilet
cleaning products, none of which worked. We now use ZEP Commercial
acidid toilet bowl cleaner. It's cleaning ability is nothing short of
amazing. However, the container does not specify what type of acid it
contains.

http://content.rpgov.net/dpw/right_t...%20Cleaner.pdf

No, but the MSDS does....


HYDROCHLORIC ACID; muriatic acid; hydrogen chloride; HCl
7647-01-0
5 - 15
SULFAMIC ACID; amidosulfonic acid; amidosulfuric acid
5329-14-6
1 - 5
QUATERNARY AMMONIUM CHLORIDES; blend of alkyl dimethylbenzyl ammonium
chlorides, alkyl dimethyl ethylbenzyl ammonium chlorides, and ethanol
85409-23-0; 68391-
01-5

The last bunch are surfactants.

http://www.homedepot.com/p/Custom-Bu...0231/300176044

It might be worth buying a pound and seeing if the sulfamic gets rid of
the mineralization by itself. If not, throw in a little HCL.
1 - 5

Sulfamic acid crystals are a milder form of Muriactic acid. Used as a
tile and grout cleaner -- made by Tile Labs. . Accidentally spilled a
drop on a paver. It looked new in that spot. Read mixture directions
explicitly.