myhandleistrain said "I'd be careful washing the underbody in the winter unless you can park in a garage after to let everything drip and dry. I did once and left it out side...transmission linkage froze so much I couldn't shift into gear and the ABS sensors quit working. "
Would be taking it for a drive to let airflow dry the car in the places you can not see . Common practice for someone that lives in Canada in the winter. Maybe your a newcomer to our Country?