- Cleaning removes visible dirt but does not kill pathogens. It must always happen before sanitising or disinfecting.
- Sanitising reduces bacteria to a safe level (look for BS EN 1276 on product labels) but is not reliably effective against viruses.
- Disinfecting kills bacteria, viruses, and fungi. For antiviral performance, look for BS EN 14476; for surface disinfection under real-world conditions, look for BS EN 13697.
- Sterilising eliminates all microbial life and is reserved for clinical environments. It is not required in standard commercial premises.
- Match the method to the risk: high-touch surfaces need regular disinfection; low-touch surfaces such as floors and windows generally need cleaning only.
- Under COSHH Regulations 2002, employers have a legal duty to assess and manage the risks associated with cleaning chemicals on their premises.
If you manage a commercial building, you’ll almost certainly have heard these terms used interchangeably.
Cleaning, sanitising, disinfecting, sterilising: they all have something to do with keeping a premises hygienic, but they are not the same thing, and using the wrong method in the wrong place can leave your workforce exposed to risks you assumed had been addressed.
It’s important to understand the differences as it has direct implications for staff health, legal compliance, and your duty of care as a facilities manager or building operator.
The Four-Tier Cleaning Hierarchy
Think of workplace hygiene not as a single activity but as a hierarchy of four distinct processes. Each one builds on the last, and each is suited to different surfaces, risk levels, and environments.
- Cleaning removes visible dirt and organic matter.
- Sanitising reduces bacteria to a safe threshold.
- Disinfecting kills a broad range of pathogens including viruses.
- Sterilising eliminates all microbial life entirely.
No single method does everything, and the right approach for your premises depends on what surfaces you are treating, how frequently they are used, and what risks they present.
What Does Cleaning Actually Do?
Cleaning is the mechanical removal of dirt, dust, grease, and organic matter from a surface.
It uses detergent and water (or a purpose-made cleaning product) to loosen and lift contamination, which is then wiped or rinsed away. Cleaning will make a surface look clean and can significantly reduce the number of microorganisms present, but it does not kill them.
A desk that looks clean after being wiped down may still carry a substantial bacterial load. Cleaning alone is not sufficient hygiene; it is the essential preparation for it.
Before any disinfectant or sanitiser can work, visible soiling must be removed first.
Organic matter interferes with chemical products, reducing their kill rate. This is why cleaning is always the first step in any decontamination process, not an optional extra.
Medical Cleaning Services for Private Clinics
What Is Sanitising, and When Should You Use It?
Sanitising goes a step beyond cleaning.
A sanitiser is a chemical product designed to reduce the number of bacteria on a surface to a level deemed safe under public health guidelines.
It does not necessarily kill all bacteria, and it is not reliably effective against viruses.
The key standard to be aware of in a UK commercial context is BS EN 1276, which specifies that a certified product must achieve a 99.999% reduction in bacterial activity within five minutes.
If a sanitiser carries this certification, you can be confident it has been independently tested to a defined threshold.
Sanitising is well-suited to food preparation areas, kitchen surfaces, and breakout rooms.
In a standard office environment, it is an appropriate choice for low-risk surfaces that benefit from routine microbial reduction but do not present a high risk of viral transmission.
What Is Disinfecting, and When Does Your Workplace Need It?
Disinfection is a more powerful process.
A disinfectant kills bacteria, viruses, and fungi rather than simply reducing their numbers. It is the appropriate method for high-touch surfaces, communal areas, and any space where there is a meaningful risk of cross-contamination.
Two British Standards are worth knowing when selecting or specifying disinfection products.
BS EN 14476 is the antiviral standard. Products certified to this standard have been tested against a range of enveloped and non-enveloped viruses, including influenza A and norovirus. If protecting your team against viral transmission is a priority, this is the certification to look for on a product label.
BS EN 13697 tests a product’s bactericidal performance on non-porous surfaces under real-world conditions, rather than controlled laboratory settings. It is broadly considered a more practical benchmark for surface disinfection in commercial environments.
The 50% contamination rule
The case for regular disinfection of touch points is compelling.
Research indicates that if a single employee arrives at work with a contagious illness, within four hours, up to 50% of shared office surfaces (door handles, lift buttons, kitchen appliances) can become contaminated.
The average office desk carries around 400 times more bacteria than a toilet seat. These are not figures designed to alarm; they are the practical basis for a well-designed cleaning programme.
High-touch surfaces that warrant routine disinfection include door handles, light switches, shared keyboards and mice, lift buttons, photocopier controls, telephones, and bathroom fittings.
These are the contact points where pathogens transfer most readily from person to person.
What Is Sterilising?
Sterilisation destroys all microbial life, including bacterial spores, which are resistant to most disinfectants.
It is the most extreme form of decontamination and requires specialised equipment or chemicals.
In practice, sterilisation is reserved for environments where the consequences of any residual microbial contamination are unacceptable.
Operating theatres, laboratories, and other clinical settings fall into this category. For the vast majority of commercial premises, including offices, warehouses, retail units, and educational buildings, sterilisation is neither necessary nor practical.
How to Decide Which Method to Use
The right approach is to match the method to the risk.
Not every surface in your building needs the same treatment.
A useful way to think about this is touch-point mapping: identifying which surfaces people contact most frequently and assigning the appropriate cleaning method to each.
Floors, windows, and ceilings are relatively low-risk surfaces because people do not touch them regularly.
These surfaces need only routine cleaning.
High-touch surfaces (all the contact points listed above) need regular disinfection. Food preparation areas benefit from sanitising products that meet BS EN 1276 or are approved for use around food.
A good cleaning contractor will map this for you and build it into a scheduled programme. Frequency should also account for occupancy levels; a busier building generally needs more frequent attention to touch points than one with a small, stable workforce.
The Compliance Picture: COSHH and Product Selection
Under the Control of Substances Hazardous to Health Regulations 2002 (COSHH), employers have a legal duty to manage the risks associated with hazardous substances in the workplace, and cleaning chemicals fall within scope.
This applies both to the cleaning staff using the products and to the building occupants who may be present when they are applied.
Compliance means carrying out a risk assessment for cleaning chemicals, confirming staff have received adequate training on their safe use, and keeping records of both.
It also means using products that have been properly tested and certified to the relevant standards. COSHH compliance is not a box-ticking exercise; it is a meaningful duty that applies to any premises where cleaning chemicals are in use.
How Alliance Cleaning Manages This Across Your Site
At Alliance Cleaning, we approach every contract with a risk-based cleaning programme built around your specific site, occupancy pattern, and sector requirements.
Our contract managers each look after a smaller number of sites than the industry average, which means they understand your building in detail rather than applying a one-size-fits-all approach.
“The question we always start with is: what are the actual risks on this site? Cleaning, sanitising, and disinfecting all have a role to play, but only if they’re applied in the right places, at the right frequency, with the right products. Getting that wrong wastes money and leaves gaps that affect your people.”
Max Yorke, Chief Operating Officer, Alliance Cleaning
Standards, training, and accountability
Our cleaning operatives are trained through the Alliance Pathway™, our in-house programme covering health and safety, COSHH compliance, product use, and site-specific procedures.
We hold ISO 9001 (Quality Management), ISO 14001 (Environmental Management), and ISO 45001 (Health and Safety Management) certifications, which means the systems underpinning our service delivery are independently verified.
With over 28 years’ experience in commercial cleaning, we work with organisations across the UK in offices, healthcare, education, hospitality, logistics, and the public sector.
To discuss how a properly structured cleaning programme could work on your site, get in touch with our team directly.
Call 01992 700073 or email [email protected]
Conclusion
Cleaning, sanitising, and disinfecting are not interchangeable. Each has a specific role, and using the right method in the right place is what separates a workplace that looks clean from one that genuinely is.
As a starting point: clean first, always.
From there, match the method to the surface and the risk.
Sanitise food preparation areas and low-risk touchpoints. Disinfect anything people touch regularly. Leave sterilisation to the clinical environments that need it. And when selecting products, check for the relevant BS EN certification rather than taking efficacy on trust.
For facilities managers, the compliance dimension matters too. COSHH places a real duty on employers to manage cleaning chemicals properly, and a well-run cleaning contract should make that straightforward rather than something you have to manage yourself.
Frequently Asked Questions
What is the difference between cleaning and sanitising?
Cleaning removes visible dirt and organic matter from a surface using detergent and physical action. Sanitising uses a chemical product to reduce the number of bacteria to a safe level. Cleaning does not kill bacteria; sanitising reduces their numbers but does not necessarily eliminate viruses.
What is the difference between sanitising and disinfecting?
Sanitising lowers bacterial counts to a safe threshold but is not reliably effective against viruses. Disinfecting kills a broad range of pathogens including bacteria, viruses, and fungi. Disinfectants are the appropriate choice for high-touch surfaces and areas where there is a meaningful risk of viral transmission.
What BS EN standards should I look for on cleaning products?
For bactericidal performance, look for BS EN 1276. For antiviral activity, look for BS EN 14476. For surface disinfection tested under real-world conditions on non-porous surfaces, look for BS EN 13697. These certifications confirm a product has met independently tested performance thresholds.
Does sanitising kill viruses?
Not reliably. Standard sanitisers are formulated to reduce bacterial counts rather than inactivate viruses. The two are different threats, and sanitising products are not tested or certified for antiviral performance. Where viral transmission is a concern, a disinfectant certified to BS EN 14476 is the more appropriate choice.
How often should high-touch surfaces be disinfected?
In a standard office, high-touch surfaces such as door handles, shared keyboards, lift buttons, and photocopier controls should be disinfected at least once a day. During periods of elevated illness in the workforce, or in higher-risk environments, more frequent attention is advisable.
When is sterilisation necessary in a commercial premises?
Sterilisation destroys all microbial life including bacterial spores. It is used in clinical environments such as operating theatres and laboratories. For standard commercial premises including offices, retail, education, and hospitality settings, sterilisation is not necessary. Disinfection to the appropriate BS EN standard is sufficient.
Do I need both cleaning and disinfecting, or will disinfecting alone suffice?
Cleaning always comes first. Organic matter (dirt, grease, dust) interferes with the effectiveness of disinfectants, reducing their kill rate significantly. Applying a disinfectant to a visibly soiled surface will not deliver the performance the product is certified to achieve. The two steps must work together.
How does Alliance Cleaning tailor its methods to different surfaces?
We carry out a touch-point mapping exercise for each site, identifying which surfaces carry the highest risk and assigning the appropriate cleaning method and frequency to each. Our contract managers review this regularly and adjust programmes when occupancy levels, building use, or sector requirements change.
How does disinfecting work in practice?
A disinfectant is applied to a pre-cleaned surface and left for the dwell/contact time specified on the product label. This is the period the product must remain wet on the surface to achieve its certified kill rate. Skipping the dwell time, or applying to a soiled surface, significantly reduces performance. A professional cleaning operative will know the correct application method, concentration, and contact time for each product they use.
What is fogging and when is it used?
Fogging uses a machine to disperse a fine mist of disinfectant across a room, coating surfaces that manual wiping cannot reach, undersides of desks, behind equipment, soft furnishings, and air voids. It is well-suited to periodic deep disinfection, post-outbreak treatment, or preparing a space that has been closed or out of use for a period. Alliance Cleaning’s electrostatic spray disinfection achieves a 99.99% kill rate against bacteria, bugs, and viruses.
What is dwell time and why does it matter?
Dwell time (also called contact time) is the period a sanitiser or disinfectant must remain wet on a surface to achieve its stated kill rate. If the product dries before this period is up, it will not perform as certified. Dwell times vary by product and pathogen and are stated on the product label or data sheet. A professional cleaning operative should know and observe the correct dwell time for every product they use.
