DIY Laundry Detergent Recipe — Does It Really Work?

The Appeal of DIY Laundry Detergent

Homemade laundry detergent has been a popular frugal living staple for years. The basic recipe — washing soda, borax, and grated bar soap — costs a fraction of commercial detergent per load and uses simple, recognizable ingredients. But does it actually work? The honest answer is: it depends on what you're washing and what you're comparing it to.

The Classic DIY Laundry Detergent Recipe

The most common homemade laundry detergent recipe combines:

• 1 cup washing soda (sodium carbonate)
• 1 cup borax
• 1 bar of soap, finely grated (Fels-Naptha, Zote, or castile soap)

Mix thoroughly and store in an airtight container. Use 2–3 tablespoons per load. Some recipes add baking soda for extra deodorizing or essential oils for scent.

For the washing soda, ARM & HAMMER Super Washing Soda is the most widely available option. For borax, Harris Borax Powder is a reliable choice.

What DIY Detergent Does Well

• Lightly soiled everyday laundry: T-shirts, underwear, and lightly worn clothing come out clean and fresh
• Odor removal: Washing soda is an effective deodorizer and works well on general body odor
• Cost: Homemade detergent costs as little as 5–10 cents per load, compared to 20–40 cents for commercial options
• Ingredient transparency: You know exactly what's in it — no synthetic fragrances, dyes, or optical brighteners

Where DIY Detergent Falls Short

No Enzymes

This is the biggest limitation. Commercial detergents contain enzymes — protease, amylase, lipase — that break down protein, starch, and fat-based stains at a molecular level. DIY recipes have no enzymes. This means they struggle significantly with food stains, blood, grass, sweat, and grease compared to enzyme-based commercial formulas.

Soap Scum in Hard Water

The grated bar soap in DIY recipes reacts with hard water minerals to form soap scum — a waxy residue that deposits on fabric and inside the washing machine drum. Over time, this causes graying, stiffness, and buildup that's difficult to remove. If you have hard water, DIY soap-based detergent is particularly problematic.

Not HE Compatible

Traditional soap produces significant suds, which can cause problems in HE washing machines. Most DIY recipes are not suitable for HE machines without modification.

No Brightening

Without optical brighteners or bleaching agents, whites may gradually gray over time with repeated DIY detergent washing.

The Verdict: Does It Really Work?

For lightly soiled laundry in soft water with a standard top-loader, DIY detergent works reasonably well. For heavily soiled items, hard water households, HE machines, or anyone dealing with tough stains, commercial enzyme-based detergent delivers meaningfully better results.

A practical middle ground: use DIY detergent for everyday lightly soiled loads and keep a commercial option like ARM & HAMMER Liquid Laundry Detergent on hand for stained or heavily soiled items.

Tips If You Want to Try DIY Detergent

• Test on lightly soiled loads first before committing fully
• Add a laundry booster like OxiClean for stained items
• Avoid using in HE machines unless you use a soap-free version (washing soda and borax only, no bar soap)
• Run a drum-cleaning cycle monthly to prevent soap scum buildup
• If whites start to gray, add oxygen bleach to the wash

Bottom Line

DIY laundry detergent works — within limits. It's cheap, simple, and free of synthetic additives, but it lacks the enzymes that make commercial detergents effective on tough stains. It's best suited for lightly soiled laundry in soft water with a standard machine. For everything else, a well-formulated commercial detergent is the more reliable choice.