Possible Clues:

• Clears, as a windshield
• Clears of condensation
• Clears the windshield, in a way
• Clears the windshield
• Makes clearer, in a way
• Clears mist from, as windows
• Clears for the road
• Restores windshield visibility
• Gets the mist off
• Improves windshield visibility