There is a place abotu 2 blocks from me that has hot water in the do-it-yourself bays. I use that and wash it very quickly (I take my own sponge as it always some inconsiderate person always uses the brush to rake up gravel i think) After fully washing the car, I quickly get it home to the garage before it freezes. REMEMBER TO WASH THE UNDERSIDE OF THE CAR AND IN THE WHEEL WELLS!!!!!!!!!!!!!!!!!!!!! It's a Subaru. It'll probably rust if you dont take special care to keep it clean in the winter.

Mike