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lock de-icer might help because it has graphite in it with a solvent to losen the goo, liquid lubes are often advised agenst for locks because the tend to attract dust and those gum the lock even more, I've had lock smiths tell me to use LPS 1 on locks to free them up, but that graphite is normally the best as it will not attract dust.
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I agree that is the standard advice. The locks I have taken apart and fixed have been packed with black muck (maybe someone elses graphite?) and there is no free space between the parts, so they stick. The method I have used on multiple car locks and a medeco door lock are the take apart to clean method. That fixes it 100%.