If I were you, I would try soaking the mats in a bathtub of warm/hot water...agitate the mats lightly while it soaks for a while (try hours...instead of minutes)...then flush the dirty water and repeat the process again and again until you find most of the salt gone...then drip dry the mat in the house where there is the heater running and it is decently warm...then, take a portable carpet steam cleaner, and give it a final good clean...
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 1995 black pearl/black Mercedes-Benz E420  :
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