In article ,
"Chris Styles" writes:
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?

Furnox DS-3 (Sulphamic Acid) will do the job, with less
potential dangers than brick acid. Add some washing up
liquid as well to act as a surficant, which might also
help if any organic matter is mixed in with the limescale.

You can normally nearly empty the trap by using the loo
brush to make the water oscillate up and down round the U.
Dissolve some Sulphamic Acid acid in warm water (or hot
water if you think there's no risk of it cracking the loo),
and then pour in, toping up if necessary to get to the
normal water level in the trap. Elbow grease doesn't help
much unless there's a lot of organic matter mixed in with
the limescale -- just leave the acid to do its work, over
night if possible. Clean round with the brush before
flushing away. You may need to repeat for really bad
cases.

If it's thick brown and not clearing, then you probably
have a layer of organic matter protecting the limescale.
To clear this, use dishwasher detergent dissolved in hot
water in the same way. Don't mix the two chemicals
together though -- alternate treatments if necessary.

--
Andrew Gabriel