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Homemade Laundry Detergent Recipe (How to Make It)

Glass jar of homemade powdered laundry detergent with grated soap, borax and washing soda

Homemade laundry detergent in powdered form takes three ingredients: a bar of Fels Naptha soap, borax and super washing soda. All three are normally stocked in the laundry aisle of a supermarket, and the method is nothing more than grating the soap and mixing it with the two powders.

The recipe makes about 4 cups, enough for 32 to 64 loads at 1 to 2 tablespoons per load. For a finer, more uniform detergent that dissolves more readily, the mixture can be run through a food processor until powdery, though that step is optional. Keep the finished detergent in an airtight container; an empty, clean detergent tub is a convenient choice.

Borax and washing soda are strong alkaline cleaners, so label the container and keep it out of reach of children and pets.

Homemade Laundry Detergent

A three-ingredient powdered laundry detergent made from grated Fels Naptha soap, borax and super washing soda, stored in an airtight container.
Prep Time15 minutes
Total Time15 minutes
Course: Household
Keyword: borax, diy laundry soap, fels naptha, homemade laundry detergent, washing soda
Yield: 4 cups (32 to 64 loads)

Materials

  • 1 bar about 5 ounces Fels Naptha laundry soap
  • 1 cup borax
  • 1 cup super washing soda

Instructions

  • Run the whole bar of Fels Naptha over the fine side of a box grater. It makes about 2 cups of shreds.
  • In a large bowl, stir both powders (the super washing soda and the borax) into the soap shavings until evenly mixed.
  • If a finer texture is wanted, pulse everything in a food processor until powdery, then let the dust settle for a minute before lifting the lid. This step is optional.
  • Keep the detergent in a labeled container that seals airtight, and shake or stir it before each use.
  • To wash, use 1 tablespoon for a regular load, including in high-efficiency (HE) machines, or 2 tablespoons for a large or heavily soiled load. Add it to the empty drum before the clothes.

Notes

The ingredients are generally found together in the supermarket laundry aisle.
An old detergent container can be reused to hold the finished powder; relabel it clearly.
Grated soap dissolves slowly in cold water. For cold washes, stir the detergent into 1 cup of hot water until dissolved and pour the liquid into the drum.
The powder makes few or no suds, which is normal for this kind of detergent.
Safety: borax and washing soda can irritate the skin, eyes and lungs. Wear gloves if your skin is sensitive, avoid breathing the dust, and store the detergent out of reach of children and pets. Use a grater and food processor bowl kept for household projects, or wash them thoroughly afterward.
Check the washing machine manual first; some manufacturers call for commercial HE detergent only.