Overview
- UK outlets amplified a TikTok method claiming fog can clear in about 10 seconds by switching on air conditioning, selecting airflow to the windscreen, using fresh air intake, and activating the rear defogger.
- The RAC advises pairing air conditioning with the heater, directing warm airflow at the glass, starting the heater cold before increasing temperature, and keeping air recirculation off to dry the cabin.
- Driving with obscured windows is illegal because it impedes vision, so motorists are told not to move until every pane is clear.
- Preventive steps include cleaning interior glass regularly to remove moisture‑holding grime, improving ventilation, and applying shaving foam as a short‑lived anti‑fog barrier when properly buffed.
- Persistent demisting problems may signal faults in air conditioning, filters, vents, the heater, or thermostats, which the RAC says should be checked by a qualified garage.