While there's no specific law at this time for not clearing off your car, it's still dangerous and you could potentially be held liable in certain situations.
Maine is forging on in prioritizing environmental research by reallocating funding from fossil fuels to researching wind, solar, and geothermal energy sources.
It was 46 years ago this week that the Clean Water Act was passed, calling for a major clean-up of Maine rivers. Thank goodness - here are the before pictures!