Charles:
I am from Michigan too, i do not drive my vette in the winter but i did purchase a item at Lowes that might help you out, It is called a (BONAIRE ultimate water blaster) if you dont mind getting your garden hose out. it was in the garden hose section and is a spray wand used for cleaning rain gutters, it has a end that rotates almost 360 and also extends to like 6 feet. it has a pretty good spray pattern, so what i do is just rotate the end and you can clean the underside of your car pretty easy.