i live in good old putzelvania, and they just LUV to use salt and salt brine to slather over everything.
my trusty "bus" [99 caravan] gets a real good "oiling" every year, done by my buddy's shop.
it then leaks oil like an old harley until it gets done the following year.
i drilled a ton of extra holes in the doors and the hatch, plus above the foam in the dog legs and rockers.
i pick a day when it's not raining to get this done. i show up early, then remove all the plugs, plus the tail lights, so the inner 1/4's get a good dousing as well.
the hood gets blasted into the forward edge through the crush zone holes.
the bottoms of the front fenders have had most of the foam removed, so that area gets hosed good as well.
cost is roughly a little over $100.00, depending on his cost of materials.
i have WAY more money in oil than i paid for this thing 10-12 years ago !
but it still ain't rusty !