When I lived up north I religiously wash the under body off to get the salt off. If not My 66 belvedere would be rust bucket in couple years. Most vehicles today have lot of plastic's. dirt and water creates rust on non treated metal parts where it sets on thin sheet metal, why you see bubbling paint on older cars that didn't get washed good. So good spray of the suspension and underside every once in while washes the dirt off. Rain water off street leaves mucky film, not as good car wash?
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