Question id 308 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Rain repellent should never be sprayed onto the windshield unless the rainfall is very heavy
The alcohol de-icing system for cockpit windows is also suitable for rain protection
The electric de-icing system for cockpit windows is also suitable for rain protection
Wipers Are Sufficient Under Heavy Rain Conditions To Provide Adequate View Through The Cockpit Windows.