Cleaning Product Labels: What You're Breathing In
Your all-purpose cleaner has ingredients you can't pronounce — and some you shouldn't inhale. Here's what's actually in household cleaning products.
You probably spend more time reading the back of a cereal box than you do reading the label on your all-purpose cleaner. That is understandable. Food labels are designed to be read. Cleaning product labels, for the most part, are not.
In the United States, there is no federal law requiring cleaning product manufacturers to list every ingredient on the label. Unlike food, which must itemize every component down to sub-ingredients, and unlike cosmetics, which must follow INCI naming conventions, household cleaning products exist in a regulatory gray zone. You get hazard warnings. You get “keep out of reach of children.” What you often do not get is a straightforward list of what is actually inside the bottle.
The European Union is ahead on this. But even there, “fragrance” on a cleaning product label can conceal dozens of undisclosed compounds. If you have ever felt lightheaded after scrubbing a bathroom or noticed a headache after mopping with a lemon-scented floor cleaner, you were not imagining it. The air inside your home during and after cleaning can contain measurable levels of volatile organic compounds, some of which are the same chemicals regulated in industrial workplaces.
This article breaks down what is required on cleaning product labels, what is hidden, and which ingredients deserve your attention.
What’s Actually Required on the Label
United States: Hazard Warnings, Not Ingredients
The Federal Hazardous Substances Act requires cleaning products to carry hazard warnings --- “CAUTION,” “WARNING,” or “DANGER” --- based on toxicity, flammability, and corrosivity. The EPA regulates products that claim to kill germs (disinfectants, sanitizers) under FIFRA, requiring an active ingredient list. But for the vast majority of cleaning products --- your dish soaps, all-purpose sprays, laundry detergents --- there is no federal requirement to disclose the full ingredient list.
Some manufacturers voluntarily disclose ingredients on their websites or labels. Many do not.
The notable exception is California’s Cleaning Product Right to Know Act (SB 258), which took effect in 2020. It requires manufacturers selling in California to disclose all intentionally added ingredients on product labels and to list fragrance allergens specifically. Because California is such a large market, some brands have adopted SB 258-compliant labeling nationwide. But this is voluntary outside California, and many products still carry minimal disclosure.
European Union: More Transparent, But Not Complete
The EU’s Detergents Regulation (EC No 648/2004) requires cleaning products to list surfactant types by category (anionic, cationic, non-ionic, amphoteric) and their concentration ranges. Products must also list any of the 26 EU fragrance allergens if they are present above 0.01%. Preservatives must be named individually regardless of concentration.
This is meaningfully better than the US approach. You can at least identify the class of surfactant and know whether specific allergens are present. But the regulation still allows broad categories rather than exact chemical names for many components, and the “fragrance” catch-all can still hide non-allergenic but potentially concerning compounds.
VOCs: The Invisible Exposure
Volatile organic compounds are chemicals that evaporate at room temperature. When you spray a cleaner or open a bottle, VOCs off-gas into your indoor air. Some continue to off-gas from treated surfaces for hours after you finish cleaning.
A 2018 study published in Science Advances found that volatile chemical products --- including cleaning agents --- now rival vehicles as a source of urban VOC emissions. The indoor concentrations during cleaning are far higher than outdoor ambient levels.
Limonene: The Citrus Trap
Limonene is extracted from citrus peels and gives many “natural” and conventional cleaners their fresh lemon or orange scent. On its own, limonene is relatively low-toxicity. The problem is what happens after you spray it.
Limonene reacts with ozone --- present in indoor air from outdoor infiltration and some electronic devices --- to produce formaldehyde and secondary organic aerosols. A study from the University of California, Berkeley found that using a limonene-containing cleaner in a typical room with normal ventilation produced formaldehyde concentrations approaching workplace exposure limits. You spray a “natural citrus cleaner” and your indoor air fills with a known carcinogen.
2-Butoxyethanol: The Glass Cleaner Chemical
2-Butoxyethanol (also listed as butyl cellosolve or ethylene glycol monobutyl ether) is a common solvent in glass cleaners, degreasers, and multi-surface sprays. It is what gives many glass cleaners their streak-free performance.
The EPA classifies 2-butoxyethanol as a potential concern for chronic exposure. At concentrations found during normal cleaning --- particularly in poorly ventilated bathrooms --- it can cause headaches, sore throats, and eye irritation. California’s Proposition 65 does not list it, but the EU restricts its concentration in consumer products. Some studies have linked chronic occupational exposure to blood cell damage, though household exposure levels are lower.
The Bleach-Ammonia Interaction
This is worth restating even though most people have heard it: never mix chlorine bleach with ammonia-based cleaners. The reaction produces chloramine gas, which causes respiratory distress at low concentrations and can be lethal in enclosed spaces. What people do not always realize is that this can happen accidentally --- using a bleach-based bathroom cleaner followed by an ammonia-based glass cleaner in the same space, without rinsing between products, creates the same risk.
Less well known: bleach mixed with acidic cleaners (vinegar, some descalers) produces chlorine gas. The general rule is to never combine bleach with anything except water.
Surfactants: Not All Created Equal
Surfactants are the molecules that actually do the cleaning. They reduce surface tension, allowing water to lift grease and dirt. You cannot have a functional cleaning product without surfactants. The question is which ones a product uses.
Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES) appear in dish soaps, floor cleaners, and laundry detergents. The skin irritation debate around SLS is well-documented --- it is a known irritant at high concentrations, which is why it is actually used as a standard irritant in dermatological testing. For cleaning products you apply to surfaces rather than skin, direct irritation is less of a concern, but residues on dishes and clothing can contact skin.
Cocamidopropyl Betaine is a milder surfactant derived from coconut oil, commonly used in “gentle” and “plant-based” formulations. It is generally well-tolerated, but it was named the American Contact Dermatitis Society’s Allergen of the Year in 2004. For most people it is fine. For those with contact allergies, it is a hidden trigger in products marketed specifically to sensitive users.
Alkylphenol Ethoxylates (APEs), particularly nonylphenol ethoxylate, are effective degreasers that break down into nonylphenol --- a persistent environmental pollutant and known endocrine disruptor. The EU banned APEs in cleaning products under REACH regulation. They remain legal in the United States, though many major brands have phased them out voluntarily. If your cleaner lists “non-ionic surfactants” without further specificity, APEs may or may not be among them. This is exactly the kind of disclosure gap that makes US cleaning product labels frustrating.
Optical Brighteners and Dyes
Open a bottle of blue laundry detergent and you might assume the blue dye serves some cleaning purpose. It does not. Dyes in cleaning products are purely cosmetic --- they make the product look more appealing in the bottle.
Optical brighteners (also called fluorescent whitening agents) are more interesting and more deceptive. These compounds deposit on fabric fibers and absorb UV light, re-emitting it as visible blue light. Your white shirt does not get cleaner. It just appears brighter to your eyes under daylight or fluorescent lighting. Common optical brighteners include disodium distyrylbiphenyl disulfonate and dioxo-bis stilbene compounds.
The environmental concern is real: optical brighteners are persistent in waterways, resist biodegradation, and are toxic to aquatic organisms. From a health perspective, they are potential skin sensitizers --- they remain on clothing through multiple washes, maintaining prolonged skin contact. For people with dermatitis or eczema, switching to a detergent without optical brighteners sometimes resolves symptoms that had been attributed to other causes.
The “Natural” Cleaning Product Problem
The market for natural and plant-based cleaning products has exploded, driven by consumers who are rightfully wary of conventional formulations. But “natural” is not a regulated term for cleaning products, and the assumption that plant-derived means non-toxic does not hold up.
Essential oils --- tea tree, eucalyptus, lavender, peppermint --- are widely used as active ingredients and fragrances in natural cleaners. These are VOCs. They evaporate into your indoor air just like synthetic fragrance compounds. Tea tree oil and eucalyptus oil contain 1,8-cineole and terpinen-4-ol, which can cause respiratory irritation in sensitive individuals and are toxic to cats at relatively low concentrations. A “natural” all-purpose spray scented with essential oils contributes to your indoor VOC load in the same way a synthetic one does.
Borax (sodium tetraborate) is perhaps the most striking example of the natural-equals-safe fallacy. Marketed for decades as a wholesome, old-fashioned cleaning ingredient, borax is classified as a reproductive toxicant (Category 1B) under the EU’s CLP regulation. The EU restricts its use in consumer products. In the US, it remains widely available and actively recommended in DIY cleaning recipes. The disconnect between its folksy reputation and its regulatory classification in Europe is remarkable.
“Plant-based surfactants” are often presented as inherently gentler alternatives. Some are. But decyl glucoside, a sugar-derived surfactant common in green cleaning products, can still cause contact dermatitis. The plant origin of a molecule does not determine its interaction with human biology. The molecular structure does.
This is not an argument against plant-based cleaning products. Many are genuinely better formulated than their conventional counterparts. It is an argument against using “natural” as a shortcut for safety evaluation. Every ingredient, regardless of origin, deserves individual scrutiny.
What You Can Do
Cleaning product transparency is improving, but slowly. In the meantime, the most practical steps are ventilation (open windows while cleaning), avoiding mixing products, choosing brands that voluntarily disclose full ingredient lists, and looking critically at “natural” claims.
GradeMyLabel now covers household cleaning products alongside food and cosmetics --- scan a label and get a breakdown of what is in there, what the regulatory status is across different countries, and which ingredients warrant caution.