Which laundry detergent is suitable for washable nappies?

Which laundry detergent should you use for cloth diapers? Understanding the composition, water content, dosage, and foam to avoid odors and leaks

Choosing a laundry detergent for cloth diapers isn't just about a popular brand or a pleasant scent. The detergent plays a central role in absorbency, the durability of the fabrics, and the baby's comfort.

A diaper absorbs properly as long as its fibers remain clean, open, and free of any oily film. As soon as this balance is disrupted, absorption decreases, odors appear, and leaks become more frequent.

To ensure the safety of your entire routine, also consult the complete guide to washing washable nappies , which complements this article.

Why laundry detergent is essential for cloth diapers

Laundry detergent acts directly on three fundamental pillars:

• the absorption quality of the fibers,
• the durability of the inserts,
• hygiene in contact with the skin.

An unsuitable laundry detergent often leaves an invisible greasy film (soap, glycerin, oils). Water then penetrates the fibers less effectively, urine stagnates and eventually seeps out.

If your nappies already give off an odor after washing, also consult our dedicated guide: washable nappy odor: causes and solutions .

Understanding the composition of laundry detergents

Laundry detergent is not a brand but a chemical formula . Its components determine its compatibility with washable diapers.

Surfactants (the actual cleaning agents)

Anionic: very effective but sometimes more irritating.

Non-ionic: excellent degreasers, particularly suitable for washable nappies.

Amphoteric: gentler, often found in sensitive formulas.

Without sufficient surfactants, urine residues remain trapped in the fibers.

Compatible bleaching agents

• Sodium percarbonate
• Hydrogen peroxide

Bleach should be avoided: it weakens textiles and waterproof membranes.

Ingredients to absolutely avoid

To be systematically excluded:

• Glycerin → rapid fouling
• Fabric softeners → hydrophobic film
• Soaps (Marseille, Aleppo, black…) → rich in glycerin
• Vegetable oils → saturated fibers

When the word "soap" appears only as a fragrance, the laundry detergent can still be compatible.

What is a laundry detergent compatible with cloth diapers?

A suitable laundry detergent is:

• without real soap
• without glycerin,
• without fabric softener
• sufficiently concentrated in cleaning agents.

You can check your product with our dedicated tool: test the compatibility of your laundry detergent .

List of recommended laundry detergents (field tests)

• Ariel (powder and liquid)
• The Expert/Professional Cat
• Persil Universal
• Skip Active Clean
• Formal (some references)
• Bonux, Dash, Dixan, Super Cross

Adjust the laundry detergent according to the water hardness

Water directly influences washing, foaming, and residue.

Soft water: tends to foam more.
Hard water: limescale neutralizes some of the cleaning agents.

To find out your local situation, consult the water hardness map in France .

Adjust dosage according to the water and the machine

The drum's capacity is just as important as the water quality.

• 7–10 kg: standard dose for 4–5 kg of laundry
• < 7 kg: reduce slightly
• 11–14 kg: increase moderately
• ≥ 15 kg: adjust to the actual load

For precise adjustments, use our washing routine calculator .

Too much foam in the washing machine: what to do with washable nappies?

Abundant foam does not indicate a better wash but most often an overdose or an insufficiently filled drum.

If leaks occur at the same time, also see: why washable nappies leak .

• Add 1 to 2 liters of cold water if the foam overflows
• Run an additional rinse
• Adjust the dose in subsequent cycles

Well-designed diapers and quality absorbent inserts also make washing easier and reduce residue. Discover our thin, leak-proof, adjustable washable diapers .

Conclusion

Choosing the right detergent and adjusting the dosage according to the water and washing machine helps preserve the absorbency of cloth diapers, prevent odors, and minimize leaks. A suitable washing routine ensures effective and long-lasting diapers for baby's comfort.