A $5 box of borax outperforms most $15 laundry boosters, and it has been doing so since 1891. Learning how to use borax in laundry properly means softer water, brighter whites, stronger stain removal, and fewer musty odors without any optical brighteners or fragrance dyes. It works in top-loaders and HE machines, plays nicely with nearly every detergent, and costs about 10 cents per load. Here is the right way to use it and the short list of situations where it should stay in the box.
What Borax Actually Does
Borax (sodium tetraborate) is a naturally occurring mineral that raises the pH of your wash water. Laundry detergents work better in mildly alkaline water, usually in the 8 to 9 pH range. Most tap water sits at 7, and hard-water minerals drag detergent performance down even further. A half cup of borax bumps the pH into the sweet spot, softens the water by tying up calcium and magnesium ions, and deodorizes by disrupting the bacteria that produce mildew smell.
It is not bleach. It will not whiten stained whites on its own, but paired with detergent and oxygen bleach it hits well above its weight.
Standard Dosing Chart
- Top-loader (regular load): 1/2 cup borax added to the drum before the clothes
- Top-loader (heavily soiled): 3/4 cup plus a pre-soak
- HE front-loader: 2 to 3 tablespoons added to the drum, not the detergent drawer
- Hand-wash basin (5 gallons): 1 tablespoon
- Stain pre-soak: 1 tablespoon per gallon of warm water, soak 30 minutes
Step-by-Step for a Standard Load
- Start the washer and let it fill with warm or hot water for about 30 seconds
- Add the borax directly into the water. Let it dissolve for a minute before adding clothes
- Load the clothes, add your regular detergent at the normal dose
- Run the cycle on the warmest setting the fabric allows
- Dry as usual. Whites can line-dry in sun for an extra brightening boost
For HE machines, skip the fill-and-dissolve step since these washers use very little water. Sprinkle borax over the clothes in the drum, add detergent to the drawer, and start the cycle.
Best Uses for Borax in Laundry
Certain loads benefit far more than others:
- Gym clothes and sweaty workout gear: Kills odor-causing bacteria that detergent alone leaves behind
- Cloth diapers: Strips residue and softens well water
- Kitchen towels and dishrags: Degreases better than detergent
- Vintage linens: Gentle alternative to chlorine bleach for yellowed whites
- Pet bedding: Neutralizes urine odor when combined with a warm pre-soak
- Mildewed towels: One cup in a hot-water soak restores most towels in 2 hours
When Not to Use Borax
Borax is alkaline, so skip it for wool, silk, and anything with a “dry clean only” tag. The pH change can break down protein fibers and fade bright dyes after repeated use. Skip it on waterproof technical fabrics like Gore-Tex because it can damage the DWR coating. Do not combine it with chlorine bleach in the same cycle. Add the borax to the wash and save bleach for the next load, or swap in oxygen bleach instead.
Babies and pets are sensitive to borate residue. Rinse twice when washing baby clothes or pet bedding, and consider sticking with a gentler booster like washing soda for everyday infant loads.
Making a DIY Laundry Detergent
A standard batch costs about $15 and lasts six months for a family of four:
- 1 box borax (76 oz)
- 1 box washing soda (55 oz)
- 2 bars Fels-Naptha or Zote soap, grated
- 1 container oxygen bleach (3 lb)
Mix thoroughly and store in a gasketed tub. Use 1 to 2 tablespoons per HE load, 1/4 cup for a top-loader. Works best in warm or hot water since the grated soap takes a minute to dissolve in cold.
Stain Removal Recipes
Mix 1 tablespoon borax with 1 tablespoon Dawn dish soap and 2 cups warm water. Apply to grease stains, let sit 15 minutes, launder as normal. For blood or protein stains, soak the garment in 1 gallon cold water plus 2 tablespoons borax for 30 minutes before washing. Yellow armpit stains respond well to a paste of borax, hydrogen peroxide, and a drop of dish soap scrubbed in with an old toothbrush.
Safety and Storage
Borax is a low-acute-toxicity substance but you still want it off skin and out of lungs. Wear gloves if you have sensitive hands, keep the box sealed to prevent clumping, and store it up high away from kids and pets. Spilled borax on the laundry room floor is slippery, so sweep rather than mop. If you inhale dust while pouring, rinse with water and move to fresh air.
Borax vs Washing Soda vs OxiClean
All three boost detergent, but they work differently. Washing soda (sodium carbonate) has a higher pH and cuts grease harder, but it is rougher on delicate fabrics. OxiClean uses sodium percarbonate, which releases hydrogen peroxide and actually bleaches stains. Borax sits in the middle as an all-purpose booster, water softener, and deodorizer. Keep a box of each for different jobs rather than trying to replace all of them with one product.
