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The original was posted on /r/lifehacks by /u/regulatorwatt on 2025-04-05 16:14:41+00:00.

When defrosting your windshield on a freezing cold morning, open your sun visors all the way. It traps the heat against the windshield and significantly speeds up defrosting.

If you are skeptical, open the visor on one side and not the other, you will see a remarkable difference.