Penetrating Fluid (seized lambda sensor)

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I tried to replace a lambda sensor on a Peugeot 106 earlier, but it seems to be seized. I had a 22mm sensor socket ( like this) on it with a 2 foot breaker bar and I couldn't move it at all. I've never found anything I couldn't move with this bar!

I sprayed some 3 in 1 penetrating fluid on it, but it hasn't helped. Can anyone recommend a good penetrating fluid or an alternative way of unscrewing it?

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JFReturns said:

Heat it maybe?

I'll give it a go, easy enough to heat up the exhaust manifold

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Cheers for the advice, I've bought some Plus Gas so will give it a good soaking, warm it up a bit and try again!