Muriatic acid.  But be careful.  Vinegar works too, but  the acid is better.

Let it sit until it stops fizzing, then flush to the joker valve and let it  do 
its stuff there too.  So long as there is no exposed metal anywhere along the 
way, it's safe.

Tom Buscaglia
S/V Alera 
1990 C&C 37+/40
Vashon WA
P 206.463.9200
C 305.409.3660

> On Aug 5, 2017, at 4:24 PM, wrote:
> Message: 6
> Date: Sat, 5 Aug 2017 23:23:10 +0000
> From: David <>
> To: CNC CNC <>
> Subject: Stus-List Toilet Meanderings...
> Message-ID:
> <>
> Content-Type: text/plain; charset="utf-8"
> So our toilet is getting this lime like crust (sorry) remaining even after 
> vigorous scrubing.   Bleach too aggresive.   Any suggestions?
> Thanks in advance from very scenic Great Harbour (Woods Hole).
> Sent from my Verizon 4G LTE smartphone

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