Beet juice here in Nebraska. (true.... don't laugh). The beet juice brine still has some salt in it... but not as much, and it apparently helps keep the salt working at very low temps. And.... western Nebraska is sugar beet country! An economic boon, I guess.
I heard once that they were using cheese brine in Wisconsin... ???
I've seen it used here in DuPage county on some roads to a lesser extent. You can always tell it's down prior to the impending snowfall by the multiple stripes layed down on the road surface. But lately they haven't down much when it snows. It's used extensively in CT too. When I'm there visiting I've noticed they tend to be more proactive. Hilly land and all that.
Yes you heard right that they were using the cheese brine and I heard also pickle brine.
But enough about the snow IT'S SUMMER. Don't wanna think about that four letter word until I need too.
But as to the thread question,
wash as often as possible anytime it gets above freezing.
Don't park in a warm garage because the salt/snow melt and warm environment accelerate the formation of the oxide. I perform an environmental test that does exactly that. I can get some stainless steels to rust in a week of exposure.
Knock off the snow from the wheel wells to keep the kickback from sitting on the metal in the well.
Pour warm water down the windshield cowl to wash any salty water spray or snow melt out of the drains. Keep the drains free of the autumn leaves. That's usually where I see a lot of rust start and it's not from outside, it's from inside near the drains by the splash guards.
Install an anode rust system that acts as a sacrificial metal instead of the car body becoming the sacrificial metal. It acts as the galvanic action eats away at the anode and not the car. Never used one, have no experience but have read that it does work to some extent. Kinda similar to the one in the water heater.