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Homemade laundry detergent is one of those old-fashioned money savers that still makes sense. A batch takes about 15 minutes, costs a fraction of store-bought, and lasts for months. This powder version uses just three ingredients, works in cold or warm water, and is low-sudsing, so it’s fine for high-efficiency machines in small amounts.

What you need
- 1 bar soap (4 to 5 oz), such as Fels-Naptha, Zote or a pure castile bar, finely grated
- 1 cup washing soda (sodium carbonate, found in the laundry aisle; not the same as baking soda)
- 1 cup baking soda
- Optional: 1/2 cup oxygen bleach powder for brightening, and 20 to 30 drops of essential oil for scent
- A box grater or food processor, a large bowl, and an airtight jar or tub
How to make it
- Grate the bar soap as finely as you can. A food processor with the grating disk makes it fast; pulse it again with the blade for an even finer powder.
- In a large bowl, stir together the grated soap, washing soda and baking soda (and oxygen bleach, if using).
- Add essential oil a few drops at a time and stir well to break up clumps.
- Store in an airtight container with a scoop. Label it and keep it out of reach of children.
How much to use
- Regular load: 1 tablespoon
- Large or very dirty load: 2 tablespoons
- HE machines: 1 tablespoon, added directly to the drum before the clothes
- Cold water: dissolve the powder in a cup of hot water first so it doesn’t leave specks
Tips
- Pre-treat stains with a little dish soap or a stain stick; homemade powder doesn’t have the enzymes of commercial detergents.
- Add 1/2 cup vinegar to the rinse cycle as a natural softener.
- Hard water? Use a little extra washing soda, and run a hot cleaning cycle in the machine once a month.
- Wear gloves when mixing; washing soda can irritate skin and eyes.
Is it right for your family?
Homemade detergent works great for everyday loads. If anyone in your house has very sensitive skin, try a small batch first, and check your washer’s manual, since some manufacturers recommend commercial HE detergent only.
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FAQ
Why not borax?
Many families prefer to skip borax. This recipe cleans well without it.
Will it fade colors?
Not with the basic recipe. Oxygen bleach brightens whites; test colors first.
How long does it last?
A batch does about 40 to 64 loads and keeps indefinitely if stored dry.
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