we are back home from spending 4 days down east with our Blazer parked on a lot literally on the beach .... the thought of it being exposed to salt impregnated moist air pushes my paranoia to where running it through a car wash is a necessity .... fortunately we have really good brushless car wash that does an excellent job of pressure washing the entire bottom, along with in the tire fender wells .... it has 5 levels of wash cycles that include various types of washes and paint coatings .... the next to cheapest cycle does all we need and she really looks good