If the windows are iced and snow-covered, before starting to drive you should clear:

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Clear visibility in every direction before you drive. If any glass is iced or snow-covered, your view is partly blocked and your ability to detect hazards drops. The windshield provides the forward view, the side windows let you see cars and pedestrians at intersections or during lane changes, and the rear window shows what’s behind you when you’re merging or stopping. Snow or ice on any of these surfaces creates blind spots and slower, less predictable responses. Clearing all windows gives you the widest, safest view and helps you react to what's around you. (Also make sure mirrors are free of ice so you can see vehicles beside and behind you.)