Question If mirrors are dirty before starting a trip: Answers They will likely become clean after driving a short distance. It should not be a concern. They should be cleaned before the vehicle is driven. Explanation During a pre-trip inspection, be sure to check the mirrors and windshield for dirt and anything else that could interfere with your ability to see. Clean them as necessary. Take a FREE Practice Test Now This questions appears in the following tests: Arizona Knowledge Test Class A , Michigan Knowledge Test Class A , Virginia Knowledge Test Class B ,