Wake Up to What Your Cleaning Products Leave Behind

Understanding residue, fragrance and indoor air — and why formulation matters

We use cleaning products every day — but how often do we question what they leave behind?

Washing up liquid. Laundry detergent. Surface sprays.

They are part of everyday routines, used without much thought. The assumption is simple: they clean effectively and then disappear.

But not all formulations are designed to do that.

Some ingredients are intended to remain — binding to fabric, coating surfaces or lingering in the air. Others are slow to break down, particularly in enclosed indoor environments. Over time, this repeated, low-level exposure becomes part of everyday living, even if it is rarely recognised as such.

Understanding what stays — and why — is the first step in making more informed choices about how we clean our homes.

What Does “Clean” Actually Mean?

When you wipe a surface, wash your clothes or rinse your dishes, the expectation is straightforward:

That the job is done — and nothing is left behind.

However, this depends entirely on how a product has been formulated.

Many conventional cleaning and laundry products contain:

• Synthetic surfactants
• Artificial fragrances
• Optical brighteners
• Preservatives and stabilisers

These ingredients are selected not only for cleaning performance, but also for sensory effect — appearance, scent and feel.

In some cases, they are designed not to rinse away completely.

Fragrance compounds, for example, are often engineered to adhere to fabric fibres, resisting heat and rinsing so that scent remains noticeable long after washing [1,2].

What is perceived as “fresh” may, in reality, be residual material left behind by design.

What Stays in Fabric Does Not Stay Isolated

Clothing, towels and bedding are in constant contact with the skin.

If residues remain within fibres, they do not remain static. They are:

• Rehydrated through moisture and sweat
• Released gradually through friction
• Transferred to the skin over time

This repeated exposure has been associated with skin irritation and contact dermatitis, particularly in individuals with sensitive or compromised skin [7].

Importantly, the effects are not always immediate or obvious.

They may present as:

• Dryness or tightness
• Low-level irritation
• Increased sensitivity over time

Because these symptoms develop gradually, they are rarely attributed to laundry products — even when they play a role.

Laundry is another area where formulation has a direct, ongoing impact. Fabrics sit against the skin for hours at a time, and repeated washing cycles can either reduce or build up residue depending on the products used. Choosing formulations designed to rinse cleanly becomes particularly important here.

Indoor Air: The Overlooked Exposure

Cleaning products do not only affect surfaces and fabrics.

They also affect indoor air quality.

Fragranced products, in particular, release volatile organic compounds (VOCs) into the air during and after use. In enclosed spaces, these compounds can accumulate, especially where ventilation is limited [3].

Studies have linked regular use of fragranced cleaning sprays to:

• Respiratory irritation
• Headaches
• Increased asthma symptoms over time [4]

This is not always a matter of acute reaction.

It is more often a question of ongoing, low-level exposure — repeated daily, across multiple products.

This is particularly relevant in kitchens and bathrooms, where cleaning products are used frequently and often in enclosed spaces. In these environments, the choice of formulation affects not only surfaces, but the air within the room itself.

Fragrance: Designed to Last

Fragrance is one of the least transparent components of household products.

On product labels, it is often listed simply as “parfum” or “fragrance” — a term that can represent a complex mixture of many individual chemicals [5,6].

These formulations are designed to:

• Mask base odours
• Deliver a consistent scent profile
• Persist after use

Persistence is not accidental.

It is achieved through the use of compounds that are resistant to evaporation and breakdown, allowing scent to remain on fabrics and in the air.

This raises a simple but important question:

If a fragrance is designed to remain, where does it remain — and for how long?

Why Formulation Matters

The difference between products is not only what they contain, but what they are designed to do after use.

In conventional formulations, performance is often linked to:

• Longevity of scent
• Visual effect (brightness, shine)
• Texture and feel

In contrast, well-formulated organic products typically prioritise:

• Effective cleaning
• Complete rinsability
• Biodegradability after use

This changes the outcome.

Rather than:

• Coating surfaces
• Remaining in fabrics
• Contributing to indoor air load

They are designed to:

• Perform their function
• Rinse away effectively
• Break down more readily in the environment

In practical terms:

They clean — and then they leave.

Where Change Has the Greatest Impact

It is not necessary to change everything at once.

The most meaningful improvements tend to come from addressing frequent, repeated exposures.

In most homes, these are:

• Washing up liquid
• Laundry products
• Everyday cleaning sprays

These products are used daily, often multiple times, and come into direct contact with skin, surfaces and air.

For many households, this is why washing up liquid is often the most logical place to start. It is used multiple times a day, comes into direct contact with hands and food surfaces, and is rarely questioned. A formulation that cleans effectively but rinses away fully can make a meaningful difference over time.

Small changes in these areas can significantly reduce cumulative exposure over time.

An Often Overlooked Area: Bathroom Cleaning

Bathrooms are another area where product choice is rarely questioned, yet exposure can be significant.

Toilet cleaners, in particular, are often highly fragranced and used in enclosed spaces, where residues and vapours have little opportunity to dissipate quickly.

This can contribute to:

• Lingering chemical odours
• Increased indoor air load
• Repeated inhalation exposure in a confined environment

Choosing formulations that clean effectively without relying on harsh chemicals or persistent fragrance can make a noticeable difference — not just to the surfaces being cleaned, but to the overall environment of the room.

A More Considered Approach to Cleaning

This is not about avoiding cleaning products.

It is about understanding how they work — and what remains after use.

A well-functioning home environment should feel:

• Neutral
• Comfortable
• Non-irritating

Not heavily scented or chemically persistent.

In practice, this often leads to a more considered approach — starting with the products used most frequently, and gradually extending that thinking across the home.

Final Thought

Most cleaning products are used without a second thought.

But they are not neutral.

They are formulated systems, designed with specific outcomes in mind — some visible, some less so.

Understanding those outcomes allows for more informed decisions.

Wake up to what you’re really living with.

References

1. Steinemann A. Ten questions concerning fragrance-free policies and indoor environments. Build Environ. 2019;159:106054.
2. Steinemann A. Fragranced consumer products: exposures and effects from emissions. Air Qual Atmos Health. 2016;9:861–866.
3. Nazaroff WW, Weschler CJ. Cleaning products and air fresheners as sources of indoor air pollution. Atmos Environ. 2004;38(18):2841–2865.
4. Zock JP, Plana E, Jarvis D, et al. The use of household cleaning sprays and adult asthma. Am J Respir Crit Care Med. 2007;176(8):735–741.
5. Dodson RE, Nishioka M, Standley LJ, et al. Endocrine disruptors and asthma-associated chemicals in consumer products. Environ Health Perspect. 2012;120(7):935–943.
6. European Commission. Opinion on fragrance allergens in cosmetic products (SCCS/1459/11). 2012.
7. Basketter DA, Angelini G, Ingber A, et al. Detergents and skin irritation. Contact Dermatitis. 2004;50(1):1–11.
8. International Agency for Research on Cancer (IARC). Some chemicals present in industrial and consumer products. IARC Monogr. 2013;101.
9. Holm SM, Leonard V, D’Silva M, et al. Household cleaning products: health risks and safer alternatives. Environ Health. 2020;19:1–12.