It is understandable for someone from Georgia to suggest “why not just wash your vehicle after driving it in nasty weather?”.
I live in Wisconsin. You would have to witness for yourself how aggressively (excessively) the roads here are treated with salt related products nowadays. It gets worse every year - more budgeting for subsequent years is my take. When driving in near freezing temperatures and fresh snow the traffic raises a fine moisture laden sodium/calcium/potassium (depending on product) mist that is extremely pervasive. It gets deep into every seam , nook and cranny. A car wash cannot cleanse those hard to access recesses.
