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    Every locksmith I have ever met discourages using WD-40 in locks. It turns to gum. Commented Mar 2, 2012 at 0:19
  • Well, a bike lock is a hair different from a standard lock, and I don't recommend WD40 as a lock lubricant, purely as a way to wash out whatever gunk may be clogging the mechanism. Commented Mar 2, 2012 at 1:32
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    My experiences with using TriFlow to both de-gunk and re-oil the cylinder in a Kryptonite U-lock has been very positive. It'll take quite a few drops, but it works a lot better than WD-40.
    – moshbear
    Commented Apr 19, 2013 at 11:33
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    One alternative "degunker" is "lock de-icer" spray. This is generally an alcohol-like product with modest solvent properties, and it leaves no significant residue behind. Commented Apr 19, 2013 at 18:29
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    Thin wet lube for bike chains also works well in a pinch to get the lock moving smooth.
    – Benzo
    Commented Jun 2, 2013 at 15:09