Kirkland Signature Ultra Clean Free & Clear HE Liquid Laundry Detergent

A high-performance liquid detergent utilizing a multi-enzyme complex and a synergistic surfactant blend to provide deep fiber cleaning and advanced stain lifting.

Performance Rating: 4.5

The formulation contains a highly effective triple enzyme system (Protease, Amylase, and Mannanase), which targets a wide variety of stains including proteins, starches, and food gums. The combination of anionic surfactants (SLES, LAS, TEA-LAS) and non-ionic surfactants (Ethoxylated Alcohols) ensures robust grease and oil removal. The inclusion of Polyethyleneimine Ethoxylate and Modified Polycarboxylate provides excellent soil suspension and anti-redeposition properties, while Optical Brighteners enhance the visual whiteness of fabrics.

Safety Rating: 2.2

The product contains several ingredients of concern regarding skin sensitivity. Methylchloroisothiazolinone (CMIT) and Methylisothiazolinone (MIT) are potent skin sensitizers and allergens. 2-Bromo-2-Nitropropane-1,3-Diol (Bronopol) is a preservative that can release low levels of formaldehyde and is an irritant. Additionally, the presence of Sodium Laureth Sulfate (SLES) carries a risk of trace 1,4-Dioxane contamination, and Disodium Distyrylbiphenyl Disulfonate is associated with environmental persistence.

Final Rating: 3.3

This detergent is a high-performance cleaner capable of handling tough laundry loads due to its advanced enzyme and polymer profile. However, its safety profile is significantly lowered by the use of aggressive preservatives like MIT/CMIT and Bronopol, which may cause adverse reactions for users with sensitive skin or allergies. It is an excellent cleaner but should be used with caution by those prone to dermatitis.

Verdict

This formulation is an industrially robust laundry solution designed for maximum efficacy across a wide temperature range. At its core, it utilizes a sophisticated surfactant matrix including Sodium Laureth Sulfate (SLES) and multiple forms of Benzenesulfonic acid salts, which are highly effective at emulsifying oily soils and breaking surface tension to allow water to penetrate fabrics deeply. The cleaning power is significantly boosted by a triple-enzyme cocktail: Protease targets proteinaceous stains like blood and grass; Amylase breaks down starches from pasta and sauces; and Mannanase addresses difficult-to-remove gums found in many processed foods and cosmetics. This ensures a comprehensive attack on various organic stains that standard detergents might miss. To enhance the aesthetic results, the formula includes Disodium Distyrylbiphenyl Disulfonate, a potent optical brightener that deposits on fabrics to enhance the reflection of blue light, making white fabrics appear remarkably brighter and neutralizing yellowing. The inclusion of Polyethyleneimine Ethoxylate and Modified Polycarboxylates provides essential anti-redeposition properties, ensuring that once soil is lifted from the fabric, it remains suspended in the wash water and does not settle back onto the clothing. This is particularly important for maintaining the clarity of colors over multiple washes. Hard water performance is managed by Sodium Citrate and Tetrasodium Iminodisuccinate, which sequester minerals that would otherwise interfere with surfactant efficiency. However, the chemical profile is quite aggressive regarding preservation and skin compatibility. The use of Methylchloroisothiazolinone (CMIT) and Methylisothiazolinone (MIT) are effective against microbial growth but are well-documented skin sensitizers that can trigger allergic reactions in predisposed individuals. Furthermore, the inclusion of 2-Bromo-2-Nitropropane-1,3-Diol (Bronopol) adds another layer of preservation but is sometimes criticized for its potential as a formaldehyde releaser. While these ingredients are safe for the general population when used as directed, they pose a risk for those with compromised skin barriers or chemical sensitivities. In summary, this is an excellent choice for heavy-duty household needs, providing professional-level cleanliness and brightness, though it necessitates caution for those with sensitive skin or a preference for eco-minimalist ingredient lists.

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Ingredient Evaluation

📁 Solvents and Stabilizers / 溶剂与稳定剂

🧪 WATER / 水

Purpose: Main solvent used to dissolve other ingredients.

Concerns: Low concern.

Notes: Fundamental component of liquid detergents.

🧪 Alcohol / 乙醇

Purpose: Viscosity control and solvent.

Concerns: Can be drying to skin in high concentrations.

Notes: Helps maintain product clarity and stability.

🧪 Propylene Glycol / 丙二醇

Purpose: Solvent and enzyme stabilizer.

Concerns: Low toxicity, generally recognized as safe.

Notes: Prevents the formula from freezing and stabilizes enzymes.

🧪 CALCIUM CHLORIDE / 氯化钙

Purpose: Enzyme stabilizer.

Concerns: May cause minor skin irritation in concentrated forms.

Notes: Essential for maintaining the activity of enzymes in liquid form.

📁 Surfactants (Cleaning Agents) / 表面活性剂(清洁剂)

🧪 Alcohols, C12-15, Ethoxylated / C12-15 醇聚氧乙烯醚

Purpose: Non-ionic surfactant for removing oily soils.

Concerns: Can be irritating to eyes and skin.

Notes: Commonly used for its excellent emulsifying properties.

🧪 Sodium Laureth Sulfate / 月桂醇聚醚硫酸酯钠

Purpose: Anionic surfactant for foam and cleaning.

Concerns: Potential skin irritant; may contain trace 1,4-dioxane.

Notes: Known as SLES; provides effective cleaning power.

🧪 Benzenesulfonic acid, C10-16-alkyl derivs., compds. with triethanolamine / C10-16烷基苯磺酸三乙醇胺盐

Purpose: Anionic surfactant for heavy duty cleaning.

Concerns: Skin and eye irritant.

Notes: A neutralized form of LAS used for high performance.

🧪 Sodium C10-16 Alkylbenzenesulfonate / C10-16 烷基苯磺酸钠

Purpose: Primary cleaning agent.

Concerns: Skin irritant; toxic to aquatic life in high concentrations.

Notes: Highly effective at removing organic matter.

🧪 Sodium Cocoate / 椰油酸钠

Purpose: Natural soap for cleaning and foam control.

Concerns: Low concern.

Notes: Derived from coconut oil; acts as a natural surfactant.

📁 Builders and Chelating Agents / 助剂与螯合剂

🧪 Sodium Citrate / 柠檬酸钠

Purpose: Water softener and pH regulator.

Concerns: Low concern.

Notes: Environmentally friendly alternative to phosphates.

🧪 Tetrasodium Iminodisuccinate / 亚氨基二琥珀酸四钠

Purpose: Biodegradable chelating agent.

Concerns: Low concern.

Notes: Prevents mineral interference with surfactants.

📁 Cleaning Enzymes / 清洁酶

🧪 Protease / 蛋白酶

Purpose: Breaks down protein-based stains like blood or grass.

Concerns: Potential respiratory allergen if inhaled as dust.

Notes: Bio-active ingredient for high-performance cleaning.

🧪 Amylase / 淀粉酶

Purpose: Breaks down starch-based stains like pasta or chocolate.

Concerns: Potential respiratory allergen.

Notes: Effective even at lower wash temperatures.

🧪 Mannanase / 甘露聚糖酶

Purpose: Breaks down guar gum and food thickener stains.

Concerns: Potential respiratory allergen.

Notes: Targets specific food-based stains often found in ice cream.

📁 Polymers and Performance Additives / 聚合物与性能添加剂

🧪 Polyethyleneimine Ethoxylate / 聚乙烯亚胺乙氧基化物

Purpose: Dispersing agent and soil release polymer.

Concerns: Synthetic polymer; limited biodegradation data.

Notes: Prevents dirt from re-depositing onto fabrics.

🧪 Modified Polycarboxylate / 改性聚羧酸盐

Purpose: Anti-redeposition agent.

Concerns: Non-biodegradable synthetic polymer.

Notes: Keeps soil suspended in the wash water.

🧪 DISODIUM DISTYRYLBIPHENYL DISULFONATE / 二苯乙烯基联苯二磺酸二钠

Purpose: Optical brightener.

Concerns: Can cause skin sensitivity; potential environmental bioaccumulation.

Notes: Makes clothes appear whiter and brighter by reflecting UV light.

📁 Preservatives / 防腐剂

🧪 2-BROMO-2-NITROPROPANE-1,3-DIOL / 2-溴-2-硝基丙烷-1,3-二醇

Purpose: Antimicrobial preservative.

Concerns: Can release small amounts of formaldehyde; skin sensitizer.

Notes: Also known as Bronopol.

🧪 Methylchloroisothiazolinone / 甲基氯异噻唑啉酮

Purpose: Preservative.

Concerns: Strong skin allergen; restricted in many regions.

Notes: Often used in combination with Methylisothiazolinone (MCI/MI).

🧪 Methylisothiazolinone / 甲基异噻唑啉酮

Purpose: Preservative.

Concerns: Significant contact allergen concerns.

Notes: Used to prevent microbial growth in the bottle.

📁 Others / 其他

🧪 Benzene, C10-13 alkyl derivatives / C10-13 烷基苯衍生物

Purpose: Residual raw material or chemical intermediate.

Concerns: Environmental concern; not intended as a functional ingredient.

Notes: Likely a trace residual from surfactant manufacturing.