On Sun, 23 Aug 2009 15:07:57 +0100, Derek Geldard
wrote:

In the last week or so I've freed off a corroded stop tap by heating
up a lemon in the microwave and sticking it on the exposed spindle of
the stop tap (the crossbar had loosened and come off) and repeating a
few times, then spraying the whole valve with 3 in 1 oil, then WD -40,
and then with aerosol white spray grease,

Crickey, four different treatments!