I don't even care if it's a bit wet out. Our cars are largely plastic and aluminum so I'm pretty confident that corrosion won't be a problem. I'll just give it a good wash (including spraying underneath) once it warms up a bit. I know I won't own this car forever, maybe 7-10 years, so I'm not saving it for the next guy. And I don't believe it helps resale any to claim it was never winter driven. But that's just me; obviously everyone should do what fits their own line of thinking.