Let me tell you about the day I did the math in the detergent aisle. I was holding a big orange jug — you know the one — and doing the mental arithmetic on cost per load. Then I looked at the ingredient list, which read like a chemistry exam, and thought: I make my own bread, I can my own tomatoes, I even make my own diy household cleaners recipes household cleaners. Why am I paying premium prices for scented water in a plastic jug?
That was three years ago. I haven’t bought commercial laundry detergent since.
This recipe is the one I landed on after trying several versions: three simple ingredients, ten minutes of work, and a batch that lasts our family for months. It cleans our farm clothes — and if you’ve ever tried to get chicken-coop smell out of jeans, you know that’s a serious endorsement — for a fraction of what the store charges.
A quick honest note before we start: this is a homemade laundry *soap* recipe, technically speaking, made from real soap plus washing boosters. It works beautifully in standard top-loaders. If you have a high-efficiency (HE) machine, use a small amount (we’ll get to measurements below) and check your manufacturer’s guidance — some HE manufacturers want low-sudsing products only. When in doubt, start with less.
Why Bother Making Your Own?
Three reasons, in order of how much they mattered to us:
The money. A batch of this costs a few dollars in ingredients and washes load after load after load. Compared to the big jugs, the savings over a year are the kind you actually notice — money that stays on the homestead instead of going to the detergent aisle. If you’re on our save money on groceries homestead save-money-on-the-homestead journey, this is one of the easiest wins on the list.
The simplicity. Three ingredients you can pronounce. No dyes, no mystery fragrances, no plastic jug the size of a toddler. For a family with sensitive skin in the house, the short ingredient list was the real selling point.
The satisfaction. There’s something deeply pleasing about pulling clean laundry from the line knowing you made the soap that cleaned it. Homesteading is built from a hundred small acts of self-reliance, and this is one of the simplest.
📌 Pin this: Grate the bar soap while watching TV the night before — ten lazy minutes with a box grater, and mixing day takes five minutes flat.
The 3 Ingredients (and What Each One Does)
You need exactly three things, all available at any grocery or big-box store:
- Washing soda (1 box, about 55 oz). Not baking soda — washing soda, also sold as sodium carbonate. It’s the cleaning powerhouse of the recipe: it softens hard water, cuts grease, and boosts the soap’s cleaning ability. You’ll find it in the laundry aisle, usually in a yellow box.
- Borax (1 box, about 65 oz). A naturally occurring mineral that’s been a laundry booster for generations. It deodorizes, softens water, and helps lift stains. Also in the laundry aisle.
- Bar soap (2–3 bars). Plain, unscented castile-style bar soap or a classic laundry bar works best. Avoid bars with heavy moisturizers or fancy additives — you want simple soap. Grate it finely with a box grater or blitz it in a food processor until it’s small flakes or powder.
That’s it. No essential oils required (though I’ll give you the option below), no twenty-ingredient chemistry project. The washing soda and borax do the heavy lifting; the grated soap does the actual cleaning.
A note on sourcing: buy the big boxes. This recipe makes a large batch, and the per-batch cost drops even further when you’re not buying the small boxes. Store the extra boxes somewhere dry — washing soda clumps if it absorbs moisture.
Step 1: Grate the Soap
Take your bars of soap and grate them as finely as you can. A standard box grater on the small holes works, though your arm will know about it. A food processor with the grating disc is faster, and pulsing the grated soap into a finer powder helps it dissolve better in the wash.
If the flakes are still chunky, don’t stress — they’ll dissolve fine in warm or hot water. But finer is better, especially if you mostly wash in cold water. This is the only part of the recipe that takes any real effort, and it’s genuinely about ten minutes.
Tip: Grate the soap the night before while you’re winding down. It turns mixing day into a five-minute job, and there’s something satisfying about a bowl of fresh soap flakes waiting on the counter.
Step 2: Mix Everything Together
Dump the grated soap, the full box of washing soda, and the full box of borax into a large bucket or bowl. Stir thoroughly with a big spoon or whisk until it’s completely uniform — you want every scoop to contain all three ingredients, not a layer of soap on top of a layer of powder.
Break up any clumps as you go. If your washing soda has absorbed a little moisture and formed lumps, crush them against the side of the bucket. Uniformity matters more than perfection here; a few tiny lumps won’t hurt anything.
Step 3: Store It Right
Transfer the finished detergent to an airtight container — a large glass jar, a plastic tub with a sealing lid, or a repurposed container with a scoop. Label it clearly (trust me, future you will thank present you), and keep it somewhere dry. Moisture is the enemy: it causes clumping and makes scooping annoying.
Keep the container out of reach of small children and pets, just as you would any cleaning product. “Natural ingredients” doesn’t mean “safe to eat” — washing soda and borax are cleaning chemicals and should be treated with the same respect as anything else under the sink.
How Much to Use
For a standard top-loader: 1–2 tablespoons per load. Start with one tablespoon for lightly soiled clothes and work up to two for the farm-grade dirty stuff. You’ll be amazed how little you need — this isn’t the capful-of-blue-goo world anymore.
For HE machines: use 1 tablespoon, and check your manufacturer’s guidance on homemade or low-sudsing detergents first. This recipe is naturally low-sudsing (real soap doesn’t foam like commercial detergent), which is exactly what HE machines want, but manufacturer warranties vary.
For heavily soiled work clothes, I add a half cup of washing soda directly to the drum as a booster. For whites that need brightening, the sun is still the best bleach ever invented — hang them in direct sunlight and watch the magic happen.
Scent Options (Totally Optional)
The base recipe is unscented, which I actually prefer — clean laundry should smell like nothing, or like sunshine if you line-dry. But if you miss fragrance:
- Add 20–30 drops of essential oil (lavender, lemon, or tea tree are classics) to the batch and mix well. The scent is subtle in the finished laundry — this isn’t the perfume-bomb of commercial detergent.
- Or toss a few drops on a damp washcloth in the dryer instead. Simpler, and the scent comes through more clearly.
Skip the essential oils entirely if anyone in the house has sensitivities. The unscented version cleans exactly as well.
Troubleshooting
Residue on clothes? You’re using too much. Cut back to one tablespoon. More detergent does not mean cleaner clothes — it means detergent left in the fabric.
Soap flakes not dissolving? Grate finer next time, dissolve the scoop in hot water before adding clothes, or switch to warm-water washes for the worst offenders.
Clothes feel stiff? A half cup of white vinegar in the rinse cycle (or in the fabric softener dispenser) softens naturally and rinses away any residue. We do this every load and our towels have never been happier.
Not cutting farm-level grime? Pre-treat the worst spots with a paste of washing soda and water, or just accept that some work shirts have earned their stains. They’re badges of honor.
The Real Cost Breakdown
I’m not going to give you a down-to-the-penny spreadsheet, because prices vary by store and region. But here’s the honest shape of it: one batch from these three boxes costs roughly what two or three loads of premium commercial detergent cost, and it washes for months. The savings aren’t theoretical — they’re the reason the laundry aisle no longer gets our money.
Pair this with the rest of our low-cost homestead habits — growing your own food, making your own cleaners, buying in bulk — and the small savings stack into something meaningful. That’s the whole philosophy of our homesteading for beginners skills beginner homesteading approach: a hundred small acts of independence that add up to a different way of living.
Quick Recap
Homemade laundry detergent is three ingredients — washing soda, borax, and grated bar soap — mixed in a bucket and stored airtight. Use one to two tablespoons per load, keep it dry, and enjoy laundry that costs a fraction of the store-bought stuff. Ten minutes of work, months of clean clothes, and one less plastic jug in the world.
Your turn: have you tried making your own, or is this your first batch? Either way, grate the soap tonight — future you says thanks.