I think ill try the vinegar. Ill deal with the smell.
I typically dont have too much issue with some salt residue. Thats easy enough to clean. The problems I have are the areas of heavy buildup that is like trying to grind down rocks. Even my steamer doesnt touch it with a stiff nylon brush attachment.
Thanks!
Those of us who live in the upper Midwest who deal with salted roads in the winter are well aware of all the problems associated with it on vehicles, both externally (rust and corrosion) and internally (Crusted fabric floor mats and carpets).
One solution to the fabric floor mat problem is to swap them out for vinyl floor mats. Sounds simple, even common sense, BUT I have not done this with my Subaru fabric mats for its 12 years of life in the shadows of the Frozen Tundra of Lambeau Field, and yes, they do get crusty. And yes they do look, well, worn! (Or as early 20th century satirist Will Rogers said, "I guess common sense isn`t so common!", which according to my wife, applies to me as well)
For those really rock-hard spots on friends and family vehicle winter-neglected carpets I have taken a flat-tipped screw driver and literally "chiseled" those areas trying not to break or go through the carpet backing. Some of you are wondering how this forms in the first place, but unless you`ve lived in a cold-weather area that used salt or calcium chloride to deice road and parking lots, you cannot imagine how much melted snow sticks to your shoes or boots and is brought into you vehicle when you get behind the wheel of your vehicle(yes, I religiously practice tapping my shoes together to loosen the sticky snow BEFORE swinging them into the car), especially when its super-cold and/or snowy for an extended period of winter weather. Add the ventilation system heater turned on HIGH for that same time, and leave it melt the dragged in snow (water evaporates) and dry the salt residue (gets baked repeatedly), and voila, you have the crusty mat and carpet. Here in Green Bay, WI, winter starts in late November and ends in early April (no wonder no professional football player in their right mind likes it here! It`s like a prison sentence in Siberia!) Most people living here do not get their interior cleaned (at ALL) during this time. Hence the crusty mats and carpets we see in mid-to-late April when the weather turns nice enough attack a winter-driven vehicle.
I also do use a vinegar-water mix that I heat to boiling in a quart Pyrex measuring cup in the microwave. Hot water and acetyl acid work wonders on salt and scrub with a bristle brush or old stiff bristle tooth bush. Just be careful not to scald yourself (I wear insulated rubber gloves). Rinse repeatedly with (lots) of water and blot/wipe dry with cotton towel or microfiber. Scottwax had the idea of pressure washing the REMOVED mats from the vehicle, but I do just spray them with the hose from the municipal water supply pressure. For carpets, since they cannot be removed (easily) from the vehicle, it will require a more judicious (AKA lighter) application hot water-vinegar and rinsing and a more vigorous brushing. To reduce the vinegar smell, I follow up with some Megs D101 All-Purpose Cleaner (4:1 dilution) (but the smell still lingers).