I use DILUTE!!! Hydrochloric acid. Use rubber gloves and eye protection.
Open the window first. Chlorine gas is given off as it reacts with the
limescale. Leaves the pan as clean as a whistle. I'm not sure where you get
it in the UK, builders merchants perhaps. In France you can get it in any
As I said the power version has hydrochloric acid and has the nossle to
squirt round the rim. You may need the tablets to help, or bail out the
pan.. It may take several applications and a very good brush..
limescale is alkaline, so any type of acid will remove it eventually,
depending on how thick it is.
You can try brick cleaning acid available at b&q or any bm, or one of the
proprietary cleaners, which usually don't work and are expensive
Go to Pattersons in Bristol, or your local wholesale supplier of
cleaning stuff to hotels etc. They have stuff far pokier than the
domestic retail grade.
Basically you want sulphamic acid to dissolve the scale. Hydrochloric
(brick acid, muriatic). will do this too, but is likely to develop
black crazing if the glaze was already invisibly less than perfect.
Sulphuric drain cleaner isn't much use on scale, but is useful on
You shouldn't have any problem with heat, gas or explosions, but don't
mix cleaners or you can do.
Yep - I use Furnox DS-3 which is sulphamic acid with a colour
indicator added so you can tell when it's exhausted.
Used to be available from plumbers merchants in large tubs,
but few stock it now (although they will order it in).
I get it from BES.
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That's what I use, but IME milder acid works just as well. Block the
bowl with some plastic bags and fill to the brim. Tip in a couple of
small packs of citric (50gms?) from the chemist and leave overnight.
No elbow grease required. Don't go to the pub that evening
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