How should I clean muddy and salty floor mats?

Start by letting the mats dry completely, then shake them out and use a stiff brush to break up caked-on mud. Hose them down thoroughly. For salt stains, spray with a 1:1 white vinegar and warm water solution, let it sit, scrub, and rinse. Use degreaser or dish soap for rubber mats, and avoid oversoaking carpeted mats. Hang or sun-dry them afterward.