"Bob Smith (UK)" wrote in message
...

I don't know! Earlier this year we had our gas main - and the pipe
into
the
house - renewed, as part of Transco's gas main renewal programme. When
it
was all done, they sent in a gas fitter to make sure that everything
worked.
He disconnected the boiler to bleed the feed pipe, and then checked
the
joint once he had re-connected it. To do this, he had some liquid in
one
of
the sort of plastic cannisters we might use for spraying the roses! He
swore
blind that this was some special substance approved by BG/Transco -
and
that
anything else might prove to be corrosive.

I'm still nor sure whether he was "for real" - or whether it was
actually
Fairy Liquid!

Detergent is supposed to be loaded with chlorides which do corrode
whereas
the "approved" liquids aren't and don't



No-one seems to mind having flux dribbling down the insides of gas
pipes...


Well actually they do but don't let me spoil your idea.