How to Make Homemade Laundry Detergent in 3 Easy Steps

Homemade laundry detergent is a DIY cleaning blend of grated soap, washing soda, and borax that washes clothes effectively at a fraction of commercial costs. Learning how to make homemade laundry detergent lets you control every ingredient, which is critical in Singapore where humidity keeps fabrics damp and skin reactive.

This guide walks you through 3 easy steps to a powder formula, a liquid variation, and a sensitive-skin recipe tuned for eczema-prone households. By the end, you’ll have a batch that costs roughly S$0.05 per load versus S$0.20–S$0.30 for store-bought brands, while learning when DIY isn’t the best fit.

What Is Homemade Laundry Detergent?

Homemade laundry detergent combines a fatty soap base, alkaline builder, and water-softening salt. This DIY approach avoids the synthetic surfactants, optical brighteners, and fragrance allergens found in commercial products.

In Singapore’s humid climate, DIY detergent appeals to three groups in particular:

• Families with eczema or sensitive skin seeking fragrance-free, dye-free wash routines
• Eco-conscious HDB households cutting plastic and chemical runoff
• Budget-savvy renters trimming monthly grocery bills without losing clean results

A single batch lasts a typical 4-person family 3–6 months, which makes the upfront mixing time genuinely worthwhile.

Benefits of DIY Laundry Detergent in Singapore

DIY laundry detergent excels due to Singapore’s heat, humidity, and rising eczema rates. Controlling ingredients is a health priority, not just a budget hack.

The five biggest advantages:

• Cost-Effective: Costs S$0.05 per load vs. S$0.20–S$0.30, saving S$80–S$150 per year.
• Skin-Friendly: Removes synthetic fragrances, dyes, and optical brighteners that trigger eczema flares.
• Eco-Friendly: Uses biodegradable mineral salts instead of phosphates and surfactants.
• Fabric-Gentle: Lacks enzymes that break down cotton fibres, helping clothes last longer.
• Customisable: Allows you to adjust cleaning power, scent, or whitening per load.

Pair this routine with professional deep cleaning service for bedding, sofas, and curtains to maximize allergen reduction.

What Are the Ingredients for Homemade Laundry Detergent?

Homemade laundry detergent uses simple, shelf-stable ingredients available at NTUC FairPrice, Shopee, and Lazada. You only need three core components to handle 95% of the cleaning load.

The Best 3 Ingredients for DIY Detergent

If you ask any veteran DIY-er what are the best 3 ingredients for DIY detergent, the answer rarely changes. These three carry roughly 95% of the cleaning load in any homemade formula.

Critical note: Washing soda is not baking soda. They’re chemically distinct; washing soda has a pH of ~11, baking soda only 8.3. Substituting one for the other dramatically weakens the wash.

Optional Boosters and Tools

Once you have the core three, the following extras let you tune the formula to your laundry’s specific needs:

• OxiClean (½ cup): For stain-fighting power on uniforms, kids’ clothes, and kitchen towels
• Baking soda (¼ cup): Softens water further and neutralises stubborn odours
• Essential oils (10–15 drops): Lavender, lemon, or tea tree for natural fragrance (skip if eczema-prone)
• Cheese grater, large mixing bowl, measuring cups, airtight container: all you need to mix and store

Also Read: Eco-Friendly Cleaning Services Singapore: Green Cleaning Guide

This is the core method of how to make homemade powder laundry detergent in roughly 15 minutes of active work. Powder stores longer than liquid, takes less shelf space, and works in both standard and high-efficiency (HE) machines.

Step 1: Prepare and Grate the Soap

The soap base does the heavy lifting on grease, body oils, and food spills. Prepping it correctly determines how well your finished detergent dissolves in cool wash water.

1. Unwrap the soap bar and air-dry it for 24–48 hours. Drier soap grates faster and blends more evenly.
2. Use a fine cheese grater (dedicated to non-food use) to shred the entire bar into snow-fine flakes.
3. Aim for 5–10 minutes of grating. Softer soaps go faster, harder bars (Fels-Naptha) take longer.
4. Wear a light dust mask if you’re sensitive to fine particles.

If you own a food processor with a grating attachment, run the bar through that, then clean the blade thoroughly before reuse.

Step 2: Mix the Dry Ingredients

This is where balance matters. Uneven mixing means some loads get too much soap and others not enough, which leads to residue on dark fabrics and dingy whites over time.

1. Combine grated soap, 1 cup washing soda, and 1 cup borax in a large mixing bowl.
2. Add optional ingredients (½ cup OxiClean, ¼ cup baking soda) at this stage.
3. Stir for 3–5 minutes with a wooden spoon or gloved hand until colour and texture are uniform.
4. Add 10–15 drops of essential oil last if using, then sprinkle evenly and stir again.

The finished mix should look like coarse snow with no visible clumps. If you see streaks of white powder, keep going.

Step 3: Store and Use Your DIY Detergent

Storage choice affects shelf life. In Singapore’s humidity, even mineral-based powders absorb moisture and clump within weeks if left exposed.

• Transfer to an airtight container. Mason jars, repurposed detergent tubs, or sealed plastic bins all work.
• Label clearly with date made and dosage instructions, especially in homes with children.
• Store in a cool, dry cupboard away from the bathroom and laundry yard.

Dosage by machine type:

• Standard top-loader: 1–2 tablespoons per load
• HE front-loader: 1 tablespoon (these machines need less soap by design)
• Heavily soiled load: Up to 3 tablespoons
• Cold water wash: Pre-dissolve in 1 cup hot water before adding to drum

A well-stored batch keeps for 6–12 months. If clumping develops, break it up with a fork. The cleaning power is unaffected.

How to Make Homemade Liquid Laundry Detergent

If your machine struggles with undissolved powder, homemade liquid laundry detergent is the fix. The recipe uses the same three ingredients but delivers them pre-dissolved. It’s ideal for cold-water cycles and front-loaders.

The 5-step liquid method:

1. Heat 4 cups of water in a large pot until just shy of boiling.
2. Stir in your grated soap and dissolve completely; usually 3–5 minutes of gentle stirring.
3. Add 1 cup washing soda and 1 cup borax, stirring until fully dissolved.
4. Pour into a 4–5 litre container with 8–12 cups of cool water and shake to combine.
5. Let it sit overnight. The mixture thickens to a gel-like consistency by morning.

Use 1/4 cup per load for standard machines, 2 tablespoons for HE units. Shake before each pour. Note that natural separation is normal and not a defect.

Trade-offs to know: liquid versions have a shorter shelf life of 2–3 months, take up far more storage space, and need shaking before each use. Most Singapore households default to powder for these reasons alone.

Best Homemade Laundry Detergent Recipe for Sensitive Skin

The best homemade laundry detergent for sensitive skin removes fragrance, dyes, and harsh surfactants, which are the primary contact dermatitis triggers. This formula is purpose-built for eczema-prone members but works for the entire family.

Sensitive-skin formula:

• 1 bar pure Castile soap (unscented, dye-free — Dr. Bronner’s Baby Unscented is a reliable Singapore find)
• 1 cup washing soda
• ½ cup borax (reduced from the standard 1 cup)
• ¼ cup baking soda for water softening
• Zero essential oils; even “natural” oils like lavender can flare reactive skin

Mix using Steps 2 and 3 from the powder method above. The reduced borax keeps the formula gentler while still delivering meaningful water-softening and odour control.

What Is the Best Laundry Detergent for Eczema?

The best laundry detergent for eczema is fragrance-free, dye-free, and lacks optical brighteners. A pure Castile-based DIY blend naturally excludes these flare-up triggers.

For best results, use an additional rinse cycle to remove residual detergent and maintain mattress and sofa cleaning for full allergen control. Read our guide on eco-friendly cleaning approaches for the full household picture.

Can Laundry Detergent Cause Folliculitis?

Yes. Laundry detergent can cause folliculitis, especially in Singapore’s heat where sweat and residue irritate hair follicles.

• Key Irritants: Quaternary ammonium compounds (QACs) in softeners and fragrance fixatives that linger on fabrics.
• Prevention: Use a fragrance-free DIY formula and an extra rinse cycle.

Note: If folliculitis persists after two weeks, see a GP to check for bacterial causes.

Also Read: Cleaning with Kids: Fun Tips to Get Them Involved

Tips for Using Homemade Detergent in Singapore’s Humidity

Singapore’s humidity affects how detergent behaves. These adjustments ensure your DIY laundry detergent performs consistently in local conditions.

The 6 practical adjustments:

1. Apply a detergent paste for 15–30 minutes before washing.
2. Add 1/4 cup borax if you see white residue on darks.
3. Use 1/2 cup white vinegar to soften clothes naturally.
4. Use dried lavender in the storage bin for a fragrance refresh.
5. Use direct sunlight for natural whitening of whites.

For uniforms, hijabs, and gym gear that face heavy sweat exposure, use a commercial enzyme detergent every fourth wash to clear protein residues that mineral formulas may miss.

When to Call the Pros: Deep Cleaning for Allergen-Free Homes

DIY detergent handles your wash beautifully, but clean clothes alone don’t make a clean home. Up to 47% of Singapore homes face damp or indoor mould issues (Source: PubMed), and detergent can’t reach mattresses, sofas, curtains, and carpets where allergens accumulate.

A professional deep cleaning service removes what your washing machine can’t:

• Dust mites embedded in mattresses, which is the major eczema and asthma trigger
• Mould spores in curtain folds caused by Singapore humidity
• Pet dander and skin flakes trapped in upholstery
• Detergent residue buildup in older washing machine drums

If your eczema, allergies, or unexplained skin reactions persist after switching to DIY detergent, the issue is likely environmental, not in the wash. SuperClean SG’s deep cleaning service uses commercial-grade extraction equipment to reach allergens that surface cleaning leaves behind.

For ongoing maintenance, a weekly home cleaning service or scheduled part-time maid keeps allergen levels low between deep cleans.

Also Read: Move In Cleaning Singapore: 6 Essential Inclusions To Look For

Frequently Asked Questions (FAQs)

1. What are ingredients for homemade laundry detergent?

The core ingredients for homemade laundry detergent are grated bar soap, washing soda, and borax (1 bar to 1 cup each). You can add OxiClean, baking soda, or essential oils, all available at NTUC FairPrice, Shopee, or Lazada.

2. What is the best laundry detergent for eczema?

The best laundry detergent for eczema is fragrance-free, dye-free, and free of optical brighteners. Use a Castile-based formula and always run an extra rinse cycle to remove residue.

3. Can laundry detergent cause folliculitis?

Yes—detergent residue on tight clothing triggers folliculitis in Singapore’s heat. Quaternary ammonium compounds and fragrance fixatives are the main culprits. Switching to a fragrance-free DIY version usually resolves it within 2 weeks.

4. What are the best 3 ingredients for DIY detergent?

The best 3 ingredients for DIY detergent are pure bar soap, washing soda, and borax. They handle 95% of typical wash loads for only ~S$0.05 per load.

5. Is homemade laundry detergent safe for HDB washing machines?

Yes—it is safe for both standard and HE HDB washers. Use 1 tablespoon for HE and 1–2 tablespoons for top-loaders. A lack of suds is normal and does not reduce cleaning power.

6. Why isn’t my DIY detergent producing suds — is it working?

Lack of suds doesn’t mean it isn’t working; commercial brands add foaming agents for show. Excess suds can actually leave residue on clothes.

7. When should I stop relying on DIY detergent and call a professional cleaner?

If skin reactions persist, the issue is likely environmental. Mattress allergens, curtain mould, and sofa dander require SuperClean SG’s commercial-grade extraction equipment, which handles what a wash routine cannot.

Conclusion

Mastering homemade laundry detergent in three easy steps—grating, mixing, and storing—provides a cleaner, cheaper, and skin-safer routine. Whether you prefer powder for shelf life or liquid for cold cycles, both cost roughly S$0.05 per load.

The best homemade laundry detergent recipe is tailored to your needs: fragrance-free for eczema, OxiClean-boosted for kids, or vinegar-rinsed for soft fabrics. In Singapore’s humidity, always use an airtight container and a cool storage spot.

DIY detergent has limits; it cannot reach allergens or mould in mattresses, sofas, curtains, and carpets. For a truly allergen-controlled home, pair your DIY routine with periodic professional deep cleaning.