Most are aware of the need to wash the salt off vehicles to prevent rust. Running your vehicle through a quick wash is certainly better than no wash at all. But, taking the time to wash underneath is most important to extending the life of the integrity of your vehicle. Some automatic car washes offer an undercarriage spray wash. This is ok, and again certainly better than nothing, but may not get to all the salt. Using a manual method of spray washing the frame and fender wells is the best way to ensure total salt removal.