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if you have ice inside the lower window seal you need a new window seal.
grease is acceptable for the top and channels that the glass rides in and touches, but you can't trat the lower window seal with it or it will smear all over the glass.
90% isopropyl alcohol has a freezing point well below 0, but spilling alcohol all over your rubber and paint is not a great solution. Fix the issue, not the symptoms.
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