Thats when you grab a stack of quarters (they are round, sometimes shiny pieces of metal that we used to use for making phone calls and playing video games), hit up one of those car washes that sprays the belly, and lets you use their guns or anything touchless. If I had PPF, I'd brush it too and just buff it after winter.
I don't live where it snows but we do get freeze issues on occasion, I put insulation on exterior pipes, bring hoses inside and all that fun. If I had the room to clean the truck out of elements, I'd rig a pump to filtered water tank with heating element and connected to give it a clean, then hook the hose up to a deionizer for final rinse to for spot free lazy dry.