When WD-40 is not handy (e.g., when travelling), a tiny drop of automatic transmission fluid (ATF) from the dipstick of any vehicle is a remarkably effective penetrating solvent and lubricant. I'm scared to know what they put in that stuff, but it really works. Antique car enthusiasts put a squirt in the cylinders of ancient, seized engines that have been sitting for half a century and it seeps through the crud and corrosion like magic.
They do make a WD40 "pen" if a spray bottle is too big. In most cases, i prefer a more specialist penetration oil or lube, depending on the application.
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