How to fix a “clean” office that still makes people sick — that’s the challenge many London business owners and managers face. You’ve got weekly cleaning, but staff keep calling in sick, and the air feels heavy no matter what you do.
The problem? Most regular cleaning misses the spots that matter most — vents, keyboards, under desks — and it builds up fast. We’ve seen this in offices all across London.
As the founder of Top‑Notch Cleaners, I’ll show you what really changed one London office in just 30 days. This case study will walk you through what went wrong, how we fixed it, and how deep cleaning made a real difference. You’ll learn exactly what to check, what tools work, and how to tell if your workspace needs more than a quick wipe.
Key Takeaways from the Deep Cleaning Case Study
- A clean-looking office isn’t always a healthy one
Surface-level cleaning misses hidden germs, causing high sick days. - Proper deep cleaning reduced sick days by 44%
Staff sick leave dropped from 18 to 10 days per month after 30 days. - Better air = better focus
Cleaning vents and soft surfaces improved indoor air quality (AQI dropped from 67 to 38). - Top‑Notch Cleaners worked with zero office disruption
Cleaning was done over a weekend, with no workday downtime. - Key tools made the difference
HEPA vacuums, steam mops, foggers, and eco-friendly articles are all abundant accoutrements for angry off bacilli and allergens. - Old myths were busted
Smell doesn’t mean clean, and wipes don’t cut it. - Every workspace needs a custom plan
One-size cleaning doesn’t work — real results need real strategy.
What Is a Deep Cleaning Case Study and Why Does It Matter?
A deep cleaning case study is a real-life example that shows how professional cleaning solved a problem, like frequent sick days, dust buildup, or low indoor air quality. It’s not just a sales pitch. It’s clear, step-by-step proof of what the cleaning team did, which tools and products were used, and what improved after. These stories help you understand what results to expect and why deep cleaning truly works.
Facts & Research
Regular cleaning can’t compete with deep cleaning when it comes to health, hygiene, and productivity. Here’s what the research shows — and how real offices benefit from it.
Key Statistics Backing Deep Cleaning
| Metric | Insight |
| Bacteria on office keyboards | Up to 20,000 bacteria per square inch (University of Arizona) |
| Virus survival on surfaces | Cold and flu viruses can live up to 72 hours on shared surfaces (NHS) |
| Productivity loss from sick days | UK businesses lose £77 billion yearly due to employee illness (Vitality, 2023) |
| Staff satisfaction post-cleaning | Offices that deep-cleaned saw 32% drop in complaints (Top‑Notch Cleaners, 2024) |
| AQI improvement after vent cleaning | AQI improved by 40–60% after full HVAC sanitation (Top‑Notch Cleaners study) |
Expert Opinion
Dr. Lena Morris, Workplace Hygiene Consultant:
“Offices that skip regular deep cleaning often see hidden mould, allergen buildup, and sick-building symptoms. It’s not about appearances — it’s about the surfaces and air your staff interact with every day.”
What Is a Deep Cleaning Case Study, Really?
A deep cleaning case study shows what actually happened when a business called in pros like Top‑Notch Cleaners. It’s not a sales pitch — it’s a real story, step by step.
We don’t just say we clean better. We show you proof.
In this case, one London office was dealing with sick days, stale air, and low energy. Our team came in, created a custom cleaning plan, and tracked the results. The outcome? Fewer absences, better air, and happier staff.
We believe in being clear and honest. This case study is how we back up our work — with facts, not fluff.
Why Deep Cleaning Matters for Workplace Health
It isn’t just appearance that requires a clean office; after all, a healthy workforce is key. For many hours, in some cases even persisting into the following day, germs and viruses can be waiting on the common surfaces of the phone, keyboard, bookshelf, paper files, achieving your infection level that way. When these germs accumulate, sick days go up, too.
When it comes to cutting down on sick days, proper cleaning is about addressing the spots the regular cleaning has missed. Deep cleaning can remove dormant germs that may be hiding in vents and floors, and upholstery — spots where invisible muck settles and dust and allergens may linger.
Stop the sneezing. Dirty vents and carpets don’t just make you sneeze; they can contribute to long-term health problems such as allergies and breathing difficulties. A clean(er) workspace is good for morale and employees’ general health, and makes people feel better while working.
Investing in deep cleaning is investing in your team’s health, and that means fewer sick days and a happier office overall.
The Hidden Office Hygiene Problems Behind Rising Sick Days
Sometimes, an office can look clean but still feel “off.” Staff may notice stale air, dust, or just feel tired more often. These signs of uncleanliness that the regular cleaning misses out on are trying to call your attention.
In everyday cleaning, we tend to concentrate on those points which are easy to see and feel. Perhaps it’s important to realise that germs can nestle in less conspicuous corners too, such as air conditioning outlets, carpets, keyboards and your toolbox. Dirt and allergens accumulate silently, impacting air quality and getting people sick.
At one London office, complaints from staff built up when they asked: “Why am I always ill in this place?” No amount of people with dusters was getting rid of it. That’s when a proper deep cleaning was necessary to access those tough-to-reach areas and enhance working conditions.
Identifying these sneaky problems is the key to developing a properly clean and healthy office in which your employees can flourish.
Deep Cleaning Strategy for London Offices by Top‑Notch Cleaners
We take a careful, exhaustive tour of your office. We look in every possible hiding place for dirt, dust, and germs. This helps us to design a cleaning program that is uniquely yours.
We perform weekend or after-work deep cleans to disrupt your workday in any way. Our technicians target high-risk areas such as air vents, carpets, desks, and common equipment.
Here’s what we do to bring real change:
- Disinfect keyboards and phones — stopping germs where hands touch most
- Steam-cleaning Furniture— removing dust and allergens from chairs and sofas
- Fog soft surfaces — to kill viruses in hard-to-reach spots
- Use HEPA vacuums for deep allergen and dust removal
This detailed approach helps create a healthier, fresher office for your team.
Why Deep Cleaning Makes a Real Difference
Fewer Sick Days
Deep cleaning gets after germs on the high-touch items in facilities — keyboards, door handles, phones. That cuts down on those germs, which in turn cuts down on cross-contamination between personnel. This means fewer people catch colds or flu, directly reducing sick days through proper cleaning.
Better Air, Better Focus
They spray air vents to free their airways of dust, allergens and clogged-up pollutants. Clean air is healthy, easy to breathe and tends to keep people alert. No more disgusting dust particles or stale air bogging your team down. This is why deep cleaning is key to improving workplace health and boosting productivity.
London Office Case Study: Real Results in 30 Days
In just 30 days after deep cleaning, the London office saw sick days drop from 18 to 10 per month. The air quality also improved significantly, with the AQI score moving from a poor 67 down to a healthier 38. Staff complaints about the workspace changed, too, from frequent to rare.
One team lead said, “It’s like the office could finally breathe — and so could we.”
These are perhaps the best arguments for how deep cleaning — going beyond the pristine appearance of a surface to create a healthier, more appealing work environment, where people feel better and perform better — reaps dividends.
Common Myths About Office Cleaning in London
Many people believe that if an office smells clean, it must be clean. But smell doesn’t fully tell the story. Germs and dirt can lurk in places you can’t see or smell.
Another myth is that regular cleaners handle everything. Deep spots tend to get overlooked during the day-to-day clean, and that’s where a space’s vast germ hoard tends to build up.
Some believe that as long as disinfecting wipes are in place, the office should be safe. While that can be rather convenient, they don’t really get to those hard-to-reach places like the vents or under the carpet, where allergens love to hide. You’re going to need some serious speciality tools and techniques for a good clean—like steam cleaners and HEPA vacuums—to get those hidden areas the right way.
The more you know, the better you can make the decision to have true healthful cleanliness for your office.
Tools & Checklist We Used – by Top‑Notch Cleaners
At Top‑Notch Cleaners, we use the right tools to get deep cleaning done thoroughly and safely. Our toolkit includes:
- HEPA-filter vacuums capture small particles and allergens from carpet and vents.
- Steam mops clean and refurbish carpets and fabric chairs without abrasion, utilising harmful chemicals.
- Antiviral foggers reach deep into soft surfaces that destroy viruses and bacteria buried deep in the most resilient crevices.
- Eco-safe disinfectants that shield your workforce and the environment from hard-surface cleaning.
- Vent brushes and sanitising wipes made specifically for digital devices such as keyboards and telephones to keep germs in the background.
Final Thoughts & Call to Action
Deep cleaning helps your team stay healthier, feel more refreshed, and enjoy a cleaner, more comfortable workspace. At Top-Notch Cleaners, we don’t just wipe down. We refresh the entire vibe of your office every day.
If your London office needs more than a quick wipe, contact with us. We’ll clean the air you breathe and the space you work in — properly. Let us help your team stay healthier and more productive with a deep clean that truly makes a difference.
Deep Cleaning FAQs (London Offices)
Does deep cleaning actually decrease sick days in the workplace?
Yes! A proper deep cleaning eliminates viruses, bacteria, and allergens lurking on high-touch areas, vents, and upholsteries — places regular cleaning often ignores. In fact, our case study in London saw a whopping 44% decrease in sick days just within 30 days. A cleaner workplace means fewer sick calls from your staff.
What’s the difference between deep cleaning and regular office cleaning?
A regular cleaner usually just wipes surfaces and takes out the bins. Deep cleaning, on the added hand, goes into hard-to-reach areas like vents, beneath furniture, and central aggregate devices. It additionally includes disinfection, steam cleaning, and HEPA vacuuming. It’s a abounding displace — not aloof a tidy-up.
Will deep cleaning interrupt my workday or office schedule?
No. At Top‑Notch Cleaners, we schedule our deep cleaning service after hours or on weekends across London. That means no interrupting your daily operations — just a cleaner space when you return.
How often should I book a deep cleaning for my London office?
For most offices in London, we suggest every 3-6 months with the actual period dependent on the traffic, size of the space, as well as the air quality within. If your team has a great number of sick days or allergy sufferers, you may need it more frequently.
Is deep cleaning worth the cost for small or mid-size London offices?
Absolutely! It’s not just about getting it clean – it’s an investment in wellness. Less time being ill, more productive employees, and cleaner air can go to the business owner’s benefit many times over. Most of our customers have commented on increased morale and feeling of relaxation.
