kramlavud, thanks for that.
So looks like I need 2 products... the graphite to lube the lock tumbler mechanism, and another to displace the water (or minimize its build-up) which I probably need to spray a little from time to time.
Where I live, it goes down to about -10 C / 15 F the coldest, so hopefully with the above I don't need to be heating up the key.
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