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andyp
WD40 = basically shite, hasn't got a lot of uses, but lots of people buy it!
If you want a penetrating oil that literally pays for itself time and again, Kano Kroil, even PB Blaster from USA if you can find it. Or make your own, acetone + auto gearbox oil basically.
Kroil works out around £25 a can. It probably earns me a few hundred per can in the number of things it removes quickly and without me loosing my sanity (worth £25). In the USA its more like £10-14 a can, but import duties yo. Worth it.
Then follow what everyone else has said, having very good allen's helps too, Wera ones are slightly oversize in the corners to help with bite, PB allen's are perfect sized and made from very high quality metal, park tools are shite since around 2009, or tap a decent Wera/Wiha torx into it and work back and forth until free*
*After leaving for 24 hours soaked in Kroil.