Your Recipe: Castile Soap Floor Cleaner

Your Recipe: Castile Soap Floor Cleaner

Liquid castile soap is a vegetable-oil-based soap, and it cleans floors well in very small amounts. Dr. Bronner's cheat sheet, published by Lisa Bronner, gives 2 1/2 tablespoons of soap per gallon of hot water for mopping, or 2 teaspoons per quart in a squirt bottle for small areas, and 2 tablespoons per 16 oz of water for an all-purpose spray. For wood floors her mopping guide says the main concern is excess moisture, and the National Wood Flooring Association likewise warns against wet mops on finished wood, so wring the mop until barely damp. Change the water when it turns gray, since dirty water just moves dirt around.

Where not to use it: measure carefully, because too much soap is the usual problem. Lisa Bronner notes soap residue attracts dirt and leaves slippery floors, so rinse well if bubbles remain, and the Natural Stone Institute warns that too much soap leaves a film and streaks on stone. Her guide says castile soap is safe for marble and limestone, unlike acids, but the institute recommends a neutral cleaner, stone soap or mild dish detergent, so check with your fabricator. Do not use it on unsealed or waxed wood without checking the maker's care guide, and do not soak laminate. It is a cleaner, not a disinfectant. If you need germs handled, use the disinfecting result rather than trusting a soap mix.

The single most important never-mix rule here is never add vinegar to castile soap. Lisa Bronner explains that the acid breaks the soap down into fatty acids, leaving a whitish, curdled, oily-feeling mess with no cleaning power, and that it happens whatever the order you combine them. Also never combine castile soap with bleach or ammonia; the CDC says never to mix bleach with any other cleaner. Label the bottle or bucket 'Castile + water, floors only, no vinegar' with the date. Store spray bottles capped, out of reach of children and pets, and dump bucket water after use.

If soap gets mixed with bleach or another cleaner and you smell something sharp, leave and ventilate. If a mix goes wrong, leave the room and get fresh air right away, open windows, keep kids and pets out, and call Poison Help at 1-800-222-1222 (US, America's Poison Centers). Call 911 for trouble breathing, chest pain, or if someone collapses. To mix, fill the bucket with hot water first, then add the soap so it does not foam up. Mop a small section at a time, use the least water you can, and let the floor air-dry. If a film shows up, mop once with plain water. Use the castile soap calculator below to scale the recipe for a smaller bucket or a spray bottle.

Source: Lisa Bronner (Dr. Bronner's), Dilutions Cheat Sheet for Dr. Bronner's Liquid Castile Soap (2 1/2 tablespoons per gallon of hot water for mopping; 2 tablespoons per 16 oz for spray); Lisa Bronner, Mopping with Dr. Bronner's Castile Soap or Sal Suds; Lisa Bronner, Why Vinegar & Castile Soap Don't Mix Well; Natural Stone Institute, consumer guidance on cleaning natural stone; National Wood Flooring Association, Maintenance; CDC, Cleaning and Disinfecting with Bleach. Note: confirm your soap's label and your floor maker's care guide.

General household-cleaning guidance, not medical or professional advice. The label on your product always wins; never mix cleaning products. For a poisoning emergency call Poison Help at 1-800-222-1222 (US), or 911 if someone has trouble breathing.

How Castile soap floor cleaner compares

* Illustrative starting amounts and notes, rounded -- use the calculators below for your exact numbers, and always check your product label.