How To Make Your Own Laundry Detergent
To make your own laundry detergent, grate a plain castile or low-additive soap bar and mix it with equal parts baking soda, washing soda (sodium carbonate), and — if you choose — borax. Use about 2 tablespoons of powder per load, or dissolve the same mix in water and use about ¼–½ cup of liquid (less in HE machines). Homemade detergent can cut cost and fragrance, but it is not a magic “toxin-free” substitute for real detergent chemistry: castile is soap (not surfactant laundry detergent), washing soda is alkaline and can irritate skin, and borax needs careful handling around kids and pets. Essential oils scent clothes; they do not disinfect laundry.
Safety first
- Do not make “lye detergent” at home unless you are trained. Lye (sodium hydroxide) is caustic. These recipes use finished soap bars or washing soda — not raw lye. If a DIY tutorial starts with making soap from scratch, skip it for laundry day.
- Washing soda vs baking soda. Baking soda (sodium bicarbonate) is milder. Washing soda (sodium carbonate / “super washing soda”) is much more alkaline. Wear gloves if you have sensitive skin, keep powder out of eyes, and store it labeled and dry.
- Borax honesty. Borax (sodium borate) helps with hardness and some soils. It is not “harmless because natural.” Keep it away from children and pets, do not inhale dust, and skip it if your household prefers not to use borates.
- Essential oils are scent, not sanitizer. Tea tree, lavender, or lemon oil will not kill laundry pathogens the way a hot wash, bleach (when fabric-safe), or an EPA-registered disinfectant product can. Use oils only for smell, and in small amounts so they do not spot fabric.
- HE and front-load washers. Low-sudsing matters. Homemade soap-based mixes can oversuds and leave residue. Use half the dose, run an extra rinse, and if your machine already has residue problems, stick with a HE commercial detergent.
What each ingredient actually does
- Grated castile or plain soap: lifts some dirt with water. Too much oil in the bar gums graters and can leave film. Avoid heavily moisturizing beauty bars.
- Baking soda: mild odor help and a soft buffer. It is not bleach and will not whiten like oxygen bleach.
- Washing soda: softens water and helps grease better than baking soda alone.
- Borax (optional): boosts cleaning in hard water; optional, not required.
Commercial detergents use engineered surfactants that rinse cleaner in modern machines. Homemade mixes are a budget or fragrance-control choice, not automatically “better cleaning.”
Powder recipe (simple batch)
What you need:
- 1 bar castile or other low-additive soap, finely grated
- 1 cup baking soda
- 1 cup washing soda
- 1 cup borax (optional)
- Airtight jar; gloves optional
- Grate the soap as fine as you can. Lumps can stick in dispensers or leave flecks on clothes.
- Mix equal parts baking soda, washing soda, and (if using) borax. Stir in the grated soap until even.
- Use about 2 tablespoons per load. For HE or lightly soiled loads, start with 1 tablespoon and add an extra rinse if clothes feel filmy.
- Store sealed and dry. Humidity clumps washing soda mixes.
Optional scent: 10–20 drops of essential oil mixed into a cup of the powder, then blended into the jar. That is fragrance only.
Liquid version (no raw lye)
What you need: grated soap, washing soda, borax (optional), a clean bucket, and hot water.
- Dissolve about ½–1 cup grated soap in a few quarts of hot water on the stove, stirring until melted. Do not boil hard or leave unattended.
- In a clean bucket, dissolve ½ cup washing soda and up to ½–1 cup borax in hot water.
- Combine, then top with cold water to about 2–4 gallons depending on how strong you want it. Stir. It will gel as it cools — that is normal. Whisk before each use.
- Dose: about ¼–½ cup per load; use the low end for HE/front-load.
Fels-Naptha and similar laundry bars are traditional in “Amish” liquid recipes. They clean, but they are still soap-based and can leave residue in HE machines. Grate fine and dose low.
What homemade detergent will not do
- Sanitize sick-room laundry the way bleach or a proper disinfectant cycle can
- Replace enzyme stain removers on protein or grass stains
- Fix a washer that already smells from biofilm — that needs a washer-clean cycle and less leftover soap
- Make essential oils into a disinfectant
When to use store detergent instead
Use a commercial HE detergent for baby clothes if your pediatric guidance prefers fragrance-free commercial options, for oily work clothes, for towels that must stay absorbent (soap film kills towel fluff), and any time your machine manual warns against soap-based DIY mixes. Cost savings disappear if you rewash loads.
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FAQ
Is homemade laundry detergent safe for washers?
Usually if the soap is grated fine, the dose is small, and you rinse well. Oversudsing and residue are the real risks in HE machines — not “toxins.”
How much should I use per load?
About 2 tablespoons powder or ¼–½ cup liquid; less for HE. More product does not mean cleaner clothes.
Do essential oils disinfect laundry?
No. They add scent. Disinfection needs heat, bleach when appropriate, or products labeled to disinfect laundry.
Do I need borax?
No. Many people use soap + baking soda + washing soda only. Skip borax if you prefer.
Is washing soda the same as baking soda?
No. Washing soda is stronger and more alkaline. Do not swap them 1:1 expecting the same result.