the graphite lock spray mentioned somewhere on here from maplins might be a good bet it comes in a small breath-freshener sized spray can with an orange lid. get a nice load of that in there and it should help.
http://www.maplin.co.uk/graphite-lock-lubricant-444745
i've used it to free my kryptonite chain that had sat outside for 3 months unused and that's still going strong.
@HatBeard started
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the graphite lock spray mentioned somewhere on here from maplins might be a good bet it comes in a small breath-freshener sized spray can with an orange lid. get a nice load of that in there and it should help.
http://www.maplin.co.uk/graphite-lock-lubricant-444745
i've used it to free my kryptonite chain that had sat outside for 3 months unused and that's still going strong.