What could go wrong with deicers?
"WSDOT thoroughly trains all maintenance work force plus uses the latest technology and equipment. Each winter season, we conduct roadside soil, surface water, or groundwater monitoring at highway system locations. This ongoing effort ranges from academic research projects to less formal “before and after” water sampling and testing.
Most vehicles are made with a protective under coating that helps the vehicle resist damage and corrosion. WSDOT continues to strongly recommend drivers who drive on roads treated with anti-icer wash their vehicles to prevent build-up."
http://www.wsdot.wa.gov/winter/anti.htm
