demist the car windows.    From Wordnet, Princeton University. 

Noun : She sprayed a mist of perfume onto her handkerchief. ,the mist of ignorance. ,a mist of tears.    From Dictionary.com. 

Verb (used without object) : It was misting when they went out for lunch.    From Dictionary.com. 

On cold mornings the "demist" setting in particular cleared the windscreen with impressive alacrity.    From Wordnik.com.  [Motoring] Reference

The Abarth 500C also has electric front windows and electric door mirrors with a demist function.    From Wordnik.com.  [Automotive Headlines] Reference