On 07/10/2020 13:05, tim... wrote:


"charles" wrote in message
...
In article ,
Â* tim... wrote:


"alan_m" wrote in message
...
On 06/10/2020 15:32, tim... wrote:
My toilet pan has a stain below the watermark that neither bleach nor
readily available acid (vinegar) will remove

what stronger products are easily available that will remove it?





HG products usually do what they say on the can/bottle

https://hg.eu/uk/products/hg-toilet-renovation-kit
https://hg.eu/media/poqprc2y/0631800100106.pdf


https://hg.eu/uk/products/hg-super-p...toilet-cleaner
https://hg.eu/media/jnqegorv/0532200105006.pdf

I think I saw this in B&Q (a few minutes ago), in amongst other branded
products

I left it there as I was looking for something more generic rather than
branded, as that way I don't get fooled by the over optimistic
marketing.

even generic ones will have a maker.

I meant a generic chemical

the problem with this category of product is that there doesn't appear
to be a requirement to list ingredients

and many of them don't

They just contain marketing blurb

You can't tell whether, or why, they might work better than just
squirting vinegar on the scale, at one tenth of the cost (which is what
I do to descale my shower cubicle)





If it contains anything "effective" you should be able to find an MSDS
on-line. This will sometimes contain the exact proportion of (say) acid.
It's hardly a commercial secret, anyone with O-level chemistry would be
able to estimate it in a school lab.