Overview
- Latest guidance favors progressive defrosting: start the engine, direct warm air to the glass, raise temperature gradually, and finish with a plastic scraper, with heated windshields the quickest option where available.
- Experts warn that pouring hot water—or blasting maximum heat—can trigger thermal shock and crack the glass, while cold water provides no benefit and can refreeze.
- Metal tools and improvised scrapers risk scratching the glazing, and activating wipers on frozen glass can tear blades or strain the motor without improving visibility.
- De-icing sprays and some homemade mixes can work if applied correctly, but vinegar or other acidic recipes may degrade rubber seals and should be avoided.
- Driving with iced or obstructed windows breaches Article R316-3 of the Code de la route, with fines reported from about €45 and up to €135 in more serious cases, making preventive steps like covers and sheltered parking advisable.