The best is just to keep the salt off as much as possible.

the worst thing about the salt is the temperatures warming up during the day and the snow and ice with salt melting. also it is worse if you park in a warm garage every night compared to leaving your car out in the cold. keep in mind to the salt is worse on the metal underneath than the painted car. I've seen <5 y/o cars rusted out to the point of no return, if salt isn't manaeged

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I knew a mechanic who had a undercarriage washer for his hose, his car he would do underneath every night as he pulled it into the garage.