I don't think WD40 is recommended for ignition barrels or any kind of electrical switch with contacts. I can't remember why exactly but may be because as it dries it gums up the works ( sorry that's not very helpful ) . Anyway I use a graphite powder in a puff bottle , which is designed to lubricate the mechanical side of locks. Cheap as chips for a large bottle which will last forever and you can amuse yourself by going round your house and vehicles , and lubricating everything you have that has a key.
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