Regular washing of a vehicle is just about all one can do. Today's cars are must less rust-prone than cars decades ago.
I talk to reliable auto body techs and they say the same, regular washes. They all share the same wisdom, wash your car during the winter months when temperatures are above freezing. The water will have a chance to dry off.
As for the car washes with a bottom wash, you must drive the car in slowly for the bottom wash to do its job. Many folks just drive right in while the bottom wash is still spraying in the back of the car.
If you want a bottom treatment, call German Motorsport in Gilford. They have a technician that specializes in undercoating.
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