This. I haven't washed my truck in 3-4 months and that was to prime the drivers side of it. Right now there's 6-8" of snow on the ground and half that much on most of the side streets; so I won't be washing it again for sometime.Never, but I rarely if ever wash my truck. In the past 12 months, I've washed it once, maybe twice.
During the winter I will wash it no more than twice a month if it's above freezing and no snow is in the forecast for a few days. Maybe run it through an automated wash with underbody spray once or twice during the winter. Then when spring comes around I really douche the whole car out, inside and out and detail it really nice for the summer.
+1 This phenomenon is new to me too. I just wait for the snow to melt after a storm and my car pretty much cleans itself.A car can be washed?