About $90 a year — that’s what comes back from swapping a name-brand pod or liquid detergent for a homemade powder. The pod runs about $0.20 a load; the homemade powder runs about $0.05. Multiplied across 250 loads a year (a typical two-person household with bedding and towels in the rotation), the spread is real, the recipe is simple, and the result actually works in modern HE machines.
This piece is the recipe, the honest caveats about when the homemade version isn’t enough, and what you should buy commercially even if you go DIY on the main detergent.
The recipe
Three ingredients, a five-gallon bucket or large food-grade container, and ten minutes.
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One cup washing soda (sodium carbonate, not baking soda — they are different chemicals). Look for it in the laundry aisle; Arm & Hammer makes it. Roughly $4 for a box that lasts a year.
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One cup borax. Same aisle, $5 for a box that lasts a year. (Brief safety note: borax is a low-toxicity laundry product that’s been in use for a century. Keep it out of small kids’ reach as you would any cleaning product, but it is not the radioactive material the internet sometimes makes it out to be.)
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One grated bar of Castile soap or Fels-Naptha. A bar of Castile (Dr. Bronner’s-style) runs $3–5; Fels-Naptha is $1.50 at most groceries. Grate it on a coarse cheese grater. Yes, by hand. It takes four minutes.
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Mix all three thoroughly. A whisk works in a large bowl; if you’re scaling up, a five-gallon bucket and a wooden spoon. Store airtight.
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Use 1–2 tablespoons per load. That’s it. No measuring cup, no pre-fill compartment.
The whole recipe makes about three cups of detergent — roughly 50 loads. Multiply the recipe by 5 (5 cups of each ingredient, 5 grated bars) for a 250-load batch that fits in a typical 5-gallon bucket.
Two-person household, 250 loads$90/year
The cost math, in detail
For one full bucket (250 loads):
- 5 cups washing soda: ~$2 (one full Arm & Hammer box is 7 cups, $4)
- 5 cups borax: ~$3 (one box is 9 cups, $5)
- 5 bars Fels-Naptha: ~$8 (or 5 bars Castile: ~$20)
- Total: ~$13 for 250 loads with Fels-Naptha. 5.2 cents per load.
Compare to a name-brand pod ($0.20/load) or a brand-name liquid ($0.15/load). At 250 loads/year, the spread is $24–37 per year on the materials alone — but the bucket lasts 12 months, you mix it once, and the savings get back the time too.
The widely-cited “homemade detergent saves hundreds” claims tend to be overcooked. The realistic number is the $90 in this piece, accounting for the time investment and the fact that you’ll still buy commercial stain treatment.
The honest caveats
Yes, it works in HE (high-efficiency) front-loaders. This is the most common question and the answer is yes — the recipe is intentionally low-suds. A tablespoon of this powder makes very little foam, which is what HE machines need.
It is not a stain treater. OxiClean, a commercial stain pre-treatment, or a stick of Fels-Naptha used directly on the spot still has a place. Keep one tub of OxiClean ($8) on hand for spot treatment of tough stains. The homemade detergent is the daily driver, not the heavy artillery.
It’s not great for heavily soiled items. Work clothes, painter’s clothes, oil-stained items — those want a commercial detergent with enzymes (Tide, Persil). The homemade version is fine for everything else.
Don’t use it on cloth diapers. The borax-Castile combination can leave residue that builds up on diaper fabric and reduces absorbency. Cloth diaper households have specific detergent needs; this isn’t the right product.
What’s worth not DIYing
A short list of laundry expenses where the savings are negligible and the time investment isn’t worth it:
Fabric softener. Skip it entirely. White vinegar in the rinse cycle (a quarter cup) does the same softening job and doesn’t leave residue. Modern detergents have softeners built in anyway.
Dryer sheets. Use wool dryer balls instead — three of them, $10 once, last for years. They reduce static and shorten dry time by 10–15%, which is its own electricity savings.
Stain treatment. Buy commercial. The DIY versions don’t perform as well and the cost difference is small.
Bleach. $3 for a gallon that lasts a year. The DIY versions of “natural bleach alternatives” are washing soda + hot water + sun, which works for some uses but not the disinfection cases where you actually want bleach.
The detergent is the daily driver. The OxiClean is the heavy artillery. Keep both.
A note on the math
The $90/year figure assumes 250 loads a year (a typical two-person household), $0.20 per load for a name-brand pod, and $0.05 per load for the homemade powder. Higher load counts (families with kids and bedding) see proportional savings. Households that currently buy budget detergent like Arm & Hammer liquid ($0.10/load) see a smaller but still real $13/year savings on materials.
Your laundry math
You save $38/year