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[mickeyd]

Originally Posted by karugs

Take it out and have a locksmith clean it. Then once it's clean apply graphite on it, NOT WD40. That's a common problem with brass keys. WD40 is fine as it displaces water (if it's frozen) but as soon as you can, apply the graphite.

I worked for a dealer in Chicago, and had supplies to rekey lock cylinders, and cleaning the cylinders for the customer was a way to help them save money from buying a new one, and basicly it will be as good as new.