Whether I am developing an all-purpose cleaner, dishwashing liquid, floor cleaner, or industrial degreaser, one thing always comes first—formula stability. A stable formula does much more than extend shelf life. It also affects cleaning performance, user safety, product appearance, and regulatory compliance.
If I do not build stability into the formula from the beginning, even the best ingredients cannot save the product. A liquid cleaner may separate into layers, lose its cleaning power, change color, or even become unsafe after storage.
During more than 30 years of working in formulation chemistry and large-scale manufacturing, I have seen thousands of cleaning product formulas. Some became successful commercial products. Others failed because they overlooked one simple factor: stability.
In this guide, I want to share the principles that I use when developing stable liquid cleaning products. I will explain the key ingredients, formulation methods, testing procedures, and the common mistakes that every manufacturer should avoid.
1. What Should I Define Before I Start Developing a Cleaning Product?
Before I choose any raw materials, I always define the purpose of the product. This step may sound simple, but it determines almost every decision I make later in the formulation process.
I usually ask myself several questions first.
What Will the Product Be Used For?
- Dishwashing liquid
- Glass cleaner
- Laundry detergent
- Floor cleaner
- Industrial degreaser
- Bathroom cleaner
Each application requires different cleaning performance and different chemical systems.
What Surface Will It Clean?
- Glass
- Ceramic
- Plastic
- Wood
- Metal
- Fabric
Different surfaces react differently to alkaline or acidic formulas. Choosing the wrong chemistry may damage the surface.
How Much Foam Should It Produce?
Foam is another important factor.
- Dishwashing liquids usually need rich and long-lasting foam.
- Automatic cleaning machines require low-foam formulas.
- Industrial cleaners often focus more on cleaning efficiency than foam volume.
What Appearance Should the Product Have?
I also define the product’s visual characteristics before formulation begins.
- Clear or opaque
- Colored or colorless
- Light fragrance or fragrance-free
- Thin liquid or thick gel
These choices affect ingredient compatibility throughout the entire formula.
Which Market Am I Selling To?
Regulatory requirements vary from country to country. A formula that complies with European regulations may require adjustments before it can enter the United States or the Gulf Cooperation Council (GCC) markets.
For example, hospital-grade cleaning products usually require much stricter performance standards than ordinary household cleaners. That is why I always identify the target market before selecting raw materials.
2. What Are the Core Components of a Stable Liquid Cleaning Formula?
Almost every liquid cleaning product contains several key ingredient categories. Although the percentages change depending on the application, the basic structure remains very similar.
| Component | Main Function | Typical Level (wt%) |
|---|---|---|
| Water | Carrier and solvent | 50–90% |
| Surfactants | Cleaning and emulsifying | 5–25% |
| Solvents | Remove grease and oily soil | 1–10% |
| Builders | Water softening and pH buffering | 1–10% |
| Thickeners | Viscosity adjustment | 0.2–2% |
| Preservatives | Prevent microbial growth | 0.1–1% |
| Fragrance & Color | Brand identity and appearance | 0.1–0.5% |
| Stabilizers | Maintain product uniformity | 0.1–1% |
Each ingredient category plays a different role. If one part becomes unstable, the whole formula may fail during storage or transportation.
Next, I will explain each category in more detail.
3. How Do I Choose the Right Surfactants?
Surfactants are the heart of every cleaning product. They reduce surface tension, lift dirt away from surfaces, emulsify grease, and allow soils to be washed away with water.
Without surfactants, a cleaning product simply cannot perform well.
Anionic Surfactants
Anionic surfactants usually provide excellent cleaning power and produce abundant foam.
Common examples include:
- SLES (Sodium Laureth Sulfate)
- LABSA (Linear Alkylbenzene Sulfonic Acid)
I often use these ingredients in hand dishwashing liquids and many household cleaners because they remove grease very effectively.
Nonionic Surfactants
Nonionic surfactants are much milder and work well even in hard water.
Examples include:
- APG (Alkyl Polyglucoside)
- Alcohol Ethoxylates
These ingredients improve grease removal while keeping the formula gentle.
Cationic Surfactants
Cationic surfactants are commonly used when disinfecting performance is required.
Quaternary ammonium compounds are one of the most common examples.
Amphoteric Surfactants
Amphoteric surfactants help improve compatibility and increase foam stability.
One ingredient that I frequently use is Cocamidopropyl Betaine (CAPB). It makes the formula milder while supporting rich foam.
My Preferred Surfactant Combination
In many commercial formulations, I do not rely on a single surfactant. Instead, I combine several types together.
One combination that consistently delivers excellent performance is:
- SLES
- CAPB
- APG
This balanced system gives me strong cleaning power, stable foam, improved skin mildness, and better long-term stability.
4. Which Solvents Should I Choose for Tough Grease and Stains?
Surfactants remove most dirt, but stubborn grease often requires additional help. That is where solvents become important.
A good solvent can dissolve oily soils much faster and improve overall cleaning efficiency.
Common Solvents That I Use
| Solvent | Main Benefit |
|---|---|
| Ethanol | Low toxicity, fast evaporation, quick drying |
| Butyl Glycol (2-Butoxyethanol) | Excellent grease removal for heavy-duty cleaners |
| D-Limonene | Natural citrus solvent with strong degreasing ability |
What Do I Pay Attention to When Selecting Solvents?
I never add solvents simply because they improve cleaning performance. I also consider safety, environmental regulations, and compatibility with the entire formulation.
For every solvent, I carefully evaluate:
- Flash point
- VOC regulations
- Skin irritation potential
- Compatibility with surfactants
- Storage stability
Adding too much solvent may increase cleaning power, but it can also reduce product safety or shorten shelf life. Finding the right balance is always the better solution.
5. How Can Builders and Chelating Agents Improve Formula Stability?
One factor that many new formulators overlook is water quality. Water is the largest component in most liquid cleaning products, but it is not always the same. Hard water contains calcium and magnesium ions, and these minerals can reduce cleaning performance.
To solve this problem, I add builders and chelating agents. These ingredients bind metal ions before they interfere with the surfactants. As a result, the cleaning system works more efficiently and remains stable over time.
Common Builders I Use
- EDTA
- STPP (Sodium Tripolyphosphate)
- Citric Acid
- Sodium Citrate
- GLDA
How Do These Ingredients Help?
| Ingredient | Main Function | Typical Application |
|---|---|---|
| EDTA | Binds calcium and magnesium ions | General household cleaners |
| STPP | Softens water and improves detergency | Heavy-duty cleaning products |
| Citric Acid | Controls pH and removes mineral deposits | Eco-friendly cleaners |
| Sodium Citrate | Water softener and buffer | Plant-based formulations |
| GLDA | Biodegradable chelating agent | Environmentally friendly products |
Today, many of my customers prefer environmentally responsible formulations. For these projects, I usually recommend GLDA or sodium citrate because they provide excellent performance while supporting biodegradable product claims.
6. Why Is pH Control So Important in Cleaning Product Formulation?
In my experience, pH is one of the easiest parameters to measure, but it is also one of the easiest to overlook.
The pH of a cleaning product affects cleaning performance, ingredient compatibility, product stability, and even user safety.
Typical pH Ranges
| Product Type | Typical pH |
|---|---|
| Acidic cleaners | pH 3–5 |
| Neutral cleaners | pH 6–8 |
| All-purpose alkaline cleaners | pH 9–11 |
| Heavy-duty degreasers | pH 11–13 |
Ingredients I Use to Adjust pH
- Sodium Hydroxide (to increase pH)
- Citric Acid (to lower pH)
- Lactic Acid (for mild acidic adjustment)
- Sodium Carbonate
- Borax
One important lesson I learned many years ago is that I should never adjust the pH too early.
Some surfactants and solvents can slightly change the pH after they are fully mixed into the formula. Because of that, I always measure and adjust the final pH after all ingredients have been added.
This simple step helps me avoid unnecessary reformulation later.
7. Why Do Liquid Cleaning Products Need Preservatives?
Some people believe synthetic cleaning products cannot support microbial growth. Unfortunately, that is not always true.
Most liquid cleaners contain a large amount of water. Some also include natural ingredients, plant extracts, or biodegradable surfactants. Without proper preservation, bacteria, yeast, and mold may grow during storage.
For this reason, I always include an appropriate preservative system unless the product itself provides sufficient antimicrobial protection.
Common Preservatives I Use
| Preservative | Main Advantage |
|---|---|
| Phenoxyethanol | Broad-spectrum protection and good compatibility |
| MIT (Methylisothiazolinone) | Highly effective at low concentrations |
| BIT (Benzisothiazolinone) | Suitable for many industrial cleaners |
| Sodium Benzoate | Widely used in environmentally friendly formulas |
| Silver-based preservatives | Alternative antimicrobial system for specialty products |
How Do I Choose the Right Preservative?
I evaluate several factors before making a decision:
- Product pH
- Regulatory requirements
- Target market
- Ingredient compatibility
- Desired shelf life
A preservative that performs well in one formula may not work well in another. Compatibility testing is always necessary.
8. How Can Stabilizers and Thickeners Prevent Product Separation?
One of the most common complaints I hear from customers is that a liquid cleaner separates after several months on the shelf.
In many cases, this problem can be prevented by selecting the right stabilizer and viscosity modifier.
Thickeners I Commonly Use
- Xanthan Gum
- Hydroxyethyl Cellulose (HEC)
- Carbomer
- Sodium Chloride (Salt)
What Does Each Ingredient Do?
| Ingredient | Main Function |
|---|---|
| Xanthan Gum | Improves suspension and long-term stability |
| HEC | Provides smooth viscosity and prevents settling |
| Carbomer | Creates clear gel systems |
| Sodium Chloride | Adjusts viscosity in many surfactant-based formulas |
My Advice on Using Salt
Salt is one of the most economical viscosity modifiers available, especially in surfactant-based cleaning products.
However, more salt does not always mean higher viscosity.
Every surfactant system has its own salt curve. Once the optimal level is exceeded, the micelle structure begins to collapse, and the product may actually become thinner instead of thicker.
Whenever I formulate a new product, I always determine the salt curve through laboratory testing rather than relying on estimates.
9. What Are the Most Common Stability Problems and How Do I Solve Them?
Even experienced formulators encounter stability issues during product development. The important thing is understanding the root cause and correcting it before commercial production begins.
| Problem | Possible Cause | Recommended Solution |
|---|---|---|
| Phase separation | Unbalanced surfactant system or poor mixing | Add a suitable emulsifier or co-surfactant and optimize the mixing process. |
| Cloudiness | Solvent and surfactant incompatibility | Adjust the pH or add a compatible clarifying agent. |
| pH drift | Insufficient buffering capacity | Use an appropriate buffer system and review the formulation ratio. |
| Microbial contamination | Inadequate preservative protection | Use a broad-spectrum preservative and confirm effectiveness through challenge testing. |
| Color fading | UV-sensitive dyes or prolonged light exposure | Select more stable colorants or use opaque packaging. |
| Viscosity changes | Incorrect thickener or excessive salt | Optimize the thickener system and determine the correct salt level. |
Whenever I develop a new formulation, I expect to encounter adjustments during laboratory trials. Stability optimization is an important part of product development, not a sign that the formula has failed.
By identifying these issues early, I can improve the formulation before moving into pilot production and full-scale manufacturing.
10. How Do I Test the Stability of a Cleaning Product Like a Professional?
Before I approve any formula for mass production, I always complete a series of stability tests. A formula may look perfect on the day it is made, but that does not mean it will remain stable after months of storage or transportation.
Proper stability testing helps me predict how a product will perform under different environmental conditions. It also reduces the risk of customer complaints and costly product recalls.
Stability Tests I Always Recommend
| Test | Purpose |
|---|---|
| Temperature Cycling Test | Evaluate stability after repeated exposure to low and high temperatures (4°C / 25°C / 45°C). |
| Freeze-Thaw Test | Check whether the product separates, gels, or changes after 3–5 freeze-thaw cycles. |
| pH Stability Test | Monitor pH changes during long-term storage. |
| Microbiological Challenge Test | Verify that the preservative system effectively controls microbial growth. |
| Foam Performance Test | Measure foam height and foam stability throughout the product’s shelf life. |
| Appearance Inspection | Observe color, clarity, viscosity, odor, and any phase separation. |
Whenever possible, I conduct these evaluations according to recognized ASTM or ISO testing methods. Standardized testing provides reliable data and gives my customers greater confidence in the final product.
For products intended for export, especially to North America and Europe, comprehensive stability testing is just as important as cleaning performance.
11. What Does a Basic Multi-Purpose Cleaner Formula Look Like?
Every cleaning product should be developed for its specific application, so there is no universal formula that works for every situation. However, the following example shows the basic structure that I often use as a starting point for a general-purpose household cleaner.
Example Formula (100% w/w)
| Ingredient | Percentage | Main Function |
|---|---|---|
| SLES (28%) | 10.0% | Primary surfactant |
| Builder System | 4.0% | Improve cleaning efficiency and soften water |
| Sodium Citrate | 2.0% | Chelating agent and pH buffer |
| Ethanol | 4.0% | Grease removal and quick drying |
| Sodium Chloride | 1.2% | Viscosity adjustment |
| Fragrance | 0.3% | Consumer appeal |
| Preservative | 0.2% | Microbial protection |
| Dye | 0.05% | Product appearance |
| Deionized Water | Balance to 100% | Carrier |
Performance of This Formula
- Stable for approximately 12 months under normal storage conditions.
- Clear and uniform appearance.
- Light, pleasant fragrance.
- Suitable for general household cleaning applications.
This example is intended for educational purposes only. In actual production, I always adjust the surfactant system, solvent package, viscosity, preservative, fragrance, and pH according to the target market, regulatory requirements, and customer expectations.
12. What Is My Final Advice for Developing Stable Cleaning Product Formulas?
After more than three decades of developing cleaning products, I have learned one important lesson: a successful formula is never created by simply mixing ingredients together.
A truly stable cleaning product is built on a solid understanding of chemistry, raw material compatibility, manufacturing processes, regulatory compliance, and real-world customer needs.
Every ingredient affects the others. A small adjustment to the surfactant system may change the viscosity. A different fragrance may reduce clarity. A slight pH shift can influence preservative performance. That is why I always evaluate the formula as a complete system instead of focusing on individual ingredients.
If you are developing your first cleaning product, or if you want to shorten your development cycle, starting with a professionally designed formulation can save a significant amount of time, cost, and testing.
What I Usually Recommend
- Choose a formulation that has already been validated through laboratory and stability testing.
- Use high-quality raw materials from reliable suppliers.
- Verify compatibility before scaling up production.
- Conduct complete stability and microbiological testing before launching the product.
- Adjust the formulation based on the regulations and consumer preferences of your target market.
Conclusion
Developing a stable liquid cleaning product is both a science and a practical engineering process. It requires much more than selecting effective ingredients. It also requires careful control of raw material compatibility, pH, viscosity, preservation, storage stability, and production consistency.
Throughout my career, I have found that the most successful products are not necessarily the most complex. Instead, they are the ones with balanced formulations, reliable performance, and consistent quality from batch to batch.
Whether you are creating an all-purpose cleaner, dishwashing liquid, floor cleaner, industrial degreaser, or a private label cleaning product, investing time in formulation stability at the beginning will help you reduce production risks, improve customer satisfaction, and build long-term trust in your brand.
At Finice, we work closely with global distributors, retailers, and private label brands to develop high-performance cleaning products that meet the requirements of different markets. From formulation development and stability testing to OEM and ODM manufacturing, we provide customized solutions designed for quality, consistency, and long-term commercial success.
