On Tue, 18 Aug 2015 15:39:24 +0100, Peter Parry wrote:

WD40 is mainly thin oil in lots of Stoddard Solvent (basically White
Spirit) so actually works quite well as a penetrating oil.

Not as well as Plusgas in my experience.

By far the best and cheapest penetrating oil I've come across is the
home made version of Dextron automatic transmission fluid (the red
stuff) mixed 50:50 with White Spirit.

Diesel is supposed to be quite good but I've normally reached for and
used Plusgas before I remember to try diesel. Kerosene isn't that
good.

--
Cheers
Dave.