You have good answers so far, and my reply might not be what you are looking for, but if you drive your motor home on Winter roads or park it close to salty air shorelines, you need to spray salt terminator on your chassis. It will protect your chassis from road salt while leaving a protective sheen, and when you spray it on after driving on those type roads, it dissolves and NEUTRALIZES the salt. Remember....water alone will NOT wash away the road salt.
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