On 16/05/2011 08:31, MuddyMike wrote:
On Sun, 15 May 2011 18:06:17 +0100, wrote:

Is there any realistic way of "rejuvinating" the enamel of a toilet?


I threw the pan from the house my son bought last autumn because we were
unable to remove heavy staining and limescale from the bottom of the trap.
It laid among a load of other detritus pending a trip to the tip with the
trailer right through the winter. When I did get around to dumping it, it
was clean!
It seems the winter frosts had dislodged whole sheets of limescale and other
muck.

Mike


Block it up with a bunch of plastic bags, fill to the rim, and drop a
couple of packs of kettle descaler in. Only problem is, you need to
leave it overnight. IME the time it takes to work is not related to the
strength of the acid, so no point in messing with sulphuric or
hydrochloric. IIRC limescale is soluble at PH4 or less so a mild acid is
all that's required. It's not clear to me why caustic soda would have
any effect.