According to the law, you are responsible for removing:

• Snow and ice from the windshield or window that limit your vision
• Snow and ice from the roof of the vehicle that might blow down on the windshield or windows of other vehicles
• Snow and ice from around or on the tire
• Both A & B
  Explanation:

  "The law makes the motorist responsible for removing from the vehicle snow and ice that limit vision and for clearing away from the roof of the vehicle any snow that might blow down on the windshield or windows of other vehicles."