We said we would never take ours out on the salt, but we got caught in a winter storm in VA coming back up from FL. That stuff managed to get everywhere under the coach. I couldn't wash it off until about a week later and it already started to corrode things. I have used salt terminator for years and it helps neutralize the effect. I have the one with the sprayer that mixes the chemical as you spray. I spray it, let it sit, wash it off, let it dry, spray it with a rust converter, and then use undercoat in certain areas.
2014 Georgetown 351DS
-TruCenter -Front/Rear CHF -Hellwig Links -Tiger Trak -Ran McNally GPS -ScanGauge -Truck Systems TPMS -5 Star Tune