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Stubborn Toilet Deposit

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Rincewindwiz

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Hi All,

Had a badly limestone scaled toilet - especially and under the rim.
Toilet scaling.jpg


Removed most with Killrock and Spirit of Salts no problem.

Now left with a very hard rough thin pale grey deposit between the holes and the inside edge of the rim which I cant shift.


Any suggestions on what it is and how (preferably chemically) I might shift it?
 
Wow, spirit of salts is very strong and dangerous if not used correctly, I'm surprised it's even readily available in the UK. It will dissolve cement, concrete and brick and I'm guessing it might even attack the glaze if it was used too concentrated or left too long.
 
marvoni said:
Wow, spirit of salts is very strong and dangerous if not used correctly, I'm surprised it's even readily available in the UK. It will dissolve cement, concrete and brick and I'm guessing it might even attack the glaze if it was used too concentrated or left too long.
Click to expand...

I buy it from the local hardware store lol
 
I was coming to the 'unglazed' conclusion except I cant figure why. Its not like its regular or anything and why would it be unglazed?. And why a narrow irregular strip? And why next to the water outlets which has to make it easier for limescale to form?

I'm really only interested in fixing it in case my Mother-in-Law springs a surprise inspection (that was a joke :) )!

So, in the absence of any other suggestions I think I'll go for the 'patch it and forget it' solution with a Cramer Ceramic repair kit

Thanks to all

(32% Hydrochloric acid - very nasty stuff - is available for around £4/litre from my local hardware store!)
 
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