Salt stains on floors and carpet: cleaning each surface without making it worse

What does tracked-in salt do to each floor?

Rock salt dries to a white crust. Calcium and magnesium chloride pull moisture out of the air, so their residue tends to stay damp and slick instead of drying to a powder. Both carry grit, and on a finished floor the grit does the scratching.

From the Carpet and Rug Institute, the NWFA, Mannington and Daltile. Your own floor's care guide comes first.

How do you get salt out of carpet and rugs?

The Carpet and Rug Institute's Spot Solver has separate entries for rock salt and for calcium chloride de-icer, and they differ:

1. Vacuum first. For dry salt, CRI says to vacuum up as much as possible before adding any liquid.
2. Rock salt: detergent solution. Mix 1/4 teaspoon of liquid dishwashing detergent into 1 cup of lukewarm water, and never stronger. CRI warns against laundry detergent, which can contain optical brighteners that dye fibers, and automatic dishwasher detergent, which can contain bleach.
3. Calcium chloride: vinegar solution first. Mix 1 cup of white vinegar with 2 cups of water. If that does not lift the stain, move on to the detergent solution.
4. Work it in gently. Pretest in a hidden spot. Apply with a white cloth, work from the edges toward the center, let it sit a few minutes, and blot. Do not rub.
5. Rinse and blot dry. CRI notes that leftover cleaner attracts soil, so rinse with lukewarm water, using a mist sprayer to avoid overwetting, and blot until no moisture remains.
6. Call a professional cleaner for anything that will not come out.

How do you clean salt off hardwood?

Gently, and mostly dry. The National Wood Flooring Association's winter advice starts with the grit: salt leaves a white, abrasive residue that can scratch a wood floor's surface. Sweep or dust mop often, soak up puddles with a towel right away, and take extra care cleaning wherever salt is present.

For the film itself, NWFA's maintenance guidance is to use a cleaner made specifically for the finish on your floor, and to clean spills with a dry or slightly damp cloth. It says not to use wet mops or steam mops, which damage the finish and the wood over time. Your installer or the floor's manufacturer can name the right cleaner.

What about vinyl, tile and stone?

Luxury vinyl. Follow your floor maker's instructions, because they differ. Mannington's, for its ADURA Pro rigid vinyl: sweep at least weekly, mop when needed with 2 to 3 capfuls of clear, non-sudsy ammonia-based cleaner in a gallon of warm water, and skip soap and detergent, which leave a dulling film. It also asks for doormats at every entrance and mats labeled non-staining.

Ceramic and porcelain tile. Daltile says to sweep or vacuum loose dirt before mopping, never to mop with dirty water, which spreads the dirt around, and to use cleaners specified as safe for tile and its grout. It notes that grout needs periodic cleaning to remove surface buildup, sealed or not.

Marble, limestone and other natural stone. Here the vinegar that works on carpet is exactly wrong. Daltile's stone care guidance says acids, even a light solution of vinegar and water, will etch and eventually damage many natural stones. Use a pH-neutral cleaner made for stone.

How do you keep salt out of the house?

• Mats outside and inside every door. NWFA recommends both, and asking everyone to wipe their feet. A coarse scraper mat outside knocks off the crystals; an absorbent mat inside catches the brine.
• A boot tray by the door holds the slush so the floor does not.
• Wipe paws after walks. Ice melt on paws is a pet problem as well as a floor problem; see pet-safe ice melt.
• Use less outside. The less salt on the walk, the less comes in. A 12-ounce mug treats about a 20-foot driveway; see how much salt to use.
• Garage floors are a separate problem with their own fixes: road salt and your garage floor.

What should a business do at the entrance?

Treat matting as part of the floor. CRI's guidance for commercial entrances is a mat system: scraper mats outside the door, wiper and scraper mats in the entry, and more wiper mats inside, with 12 to 15 feet of matting for an office building and up to 20 or 25 feet for a grocery store or hospital. CRI also says to watch the wear: heavy wear in one spot can mean the mats are too small. Clean them through the season, and keep loose-laid mats flat, because a curled edge is a trip hazard of its own.

A wet entry floor is a slip risk as well as a cleaning problem. For what that means for a Michigan property owner, see snow, ice and liability.