I too would like to add a word of caution on using WD40. It is great at 'freeing' things but its lubrication properties are short lived and it can often displace the original lubrication leaving as stated dry contact surfaces. If you use WD40 to free something ensure you apply an appropriate long life lubricant after, and repeat the lubrication 2-3 weeks later else you could find your fix is unfixed worse than ever.
Different joints need different lubrications but one I find handy to have in my tool box which both is fairly effective at freeing up and has a reasonable duration of lubrication properties is silicone grease spray, which is what I believe Audi use for the likes of lubrication of door locks etc. Haven't tried ACF 50 but I'll keep my eye out for some.
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