I had frozen lock problems on many of my late model vehicles that I owned when I resided in states with cold winters (and no keyless entry).
The main issue was frequent car washing to keep the salt at bay, which eventually removed the lubing that had been done...locks were fine during the day, but by nightfall, moisture trapped in the hidden crevices created havoc.
But just as previously posted, lock de-icer is designed to thaw out the moisture, so it only serves its purpose when you are in a jam.
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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