You can't really beat salt, but you can try. Don't use a car wash unless you know if they recycle their water. If they do it will be salted water, as they can't filter salt out. Not what you need. To reduce salt exposure stay out of the salted slush, keep well back from traffic in front of you. They put spray up that soaks everything under the hood. Salt is a hydrophilic chemical that will forever pull moisture from the air and keep corrosion of the metal it is on going. It uses oxygen to feed the corrosion and damage is sure to come. Spraying something over it to block the oxygen for awhile helps, but must be replenished often or yearly. One product to stop the corrosion is corrosion x, out of Texas if I recall right. It comes in 3 formulas, marine, aviation, auto I think. It says it gets between the metal and the salt, lasts for a year unless blasted away. Woodmizer wants their mills oiled with ATF diluted with fuel sprayed over them. ATF has more rust inhibiting crap than other oils and ATF doesn't hurt seals and such, Mix it 3qts in a 5 qt jug and thin it, then put it in a good spray bottle and spray it on the metal you want to keep.Power paint sprayers work too,even bug sprayers .Don't spray near fire. But keep the stuff clean, no dirt . Dirt clogs and stops the sprayers and causes great rage in the spray man. Also if you have a spell before you are going to disassemble something corroded, pre spray it with the stuff and it helps it come apart later. I use this oil mix by the gallon, under the hood, exhaust, body[do the inside of the doors] frame,everything. 3 qts will do a pick up.Wash the brakes off with brake spray if you get it on them.
Making plastic fender liners helps. The rino spray bed liner stuff sprayed on the body lower sections when new will stay there even after the steel is gone. Rockers, doors, cab corners , under body all do real well with rino. How much money have you got. Good luck.
