I understand the desire to keep the car looking its best. I haven't driven my ZL1 in the rain yet, but it isn't my daily driver. For me, I don't even like to drive the car if it is dirty (read dusty).
I don't care about any of my other cars, but the Z is special. Don't worry what other say or do. If you want it immaculate then go for it. If you want to drive it as a daily driver, that's cool too. Whatever floats your boat.
