Overview
- The RAC recommends using the front defrost setting to send hot, dry air onto the windscreen to clear frost and fog.
- A widely shared explainer notes that many cars automatically switch on air conditioning to dry the air and turn off recirculation when defrost is selected.
- Drivers are advised to direct cabin fans toward the windscreen and passenger windows and to activate rear-window and side-mirror heaters where available.
- Heated glazing with thin embedded wires can melt ice quickly without harming the glass, and the RAC advises using the highest temperature settings.
- For prevention, the RAC suggests overnight measures such as sheltered parking, windscreen covers, and door or mirror covers to reduce scraping time.