Cleaning removes dirt and most germs, sanitising reduces the germs that are left to a safer level, and disinfecting kills most remaining bacteria and viruses on a surface. For most rooms on most days, thorough cleaning is all a healthy home needs. Sanitising and disinfecting are targeted extra steps, and they only work properly on a surface you have cleaned first.
This guide explains what each step does, the order to do them in, when disinfecting is actually worth it, and how to use products safely.
Cleaning, sanitising and disinfecting explained
| Step | What it does | How it is done |
|---|---|---|
| Cleaning | Physically removes dirt, grease, food residue and most germs | Detergent or soap, warm water, a cloth or brush and some elbow grease |
| Sanitising | Lowers the number of germs left on a surface to a level considered safe | A sanitiser, a food-safe sanitising spray or very hot water (for example a dishwasher’s hot cycle) |
| Disinfecting | Kills most bacteria and viruses on a hard surface | A disinfectant or diluted bleach, left wet for the time stated on the label |
The key point is that cleaning does most of the work. Detergent lifts grime and the germs sitting in it, and rinsing or wiping carries them away. Public-health guidance generally agrees that routine cleaning is enough to keep a typical home healthy.
Why you always clean first
Disinfectant cannot kill what it cannot reach. Grease, food residue, soap scum and limescale form a layer that shields germs underneath, and many disinfectants are weakened by contact with dirt. Spraying disinfectant onto a visibly grubby worktop mostly wastes the product.
The correct order is simple:
- Clean with warm water and detergent to remove visible dirt.
- Rinse or wipe away the residue.
- Sanitise or disinfect only if the situation calls for it.
- Leave it wet for the contact time, then rinse food-contact surfaces if the label says so.
Some products are sold as “cleaner and disinfectant in one”. They can do both jobs on lightly soiled surfaces, but on greasy or heavily used areas you still get a better result by cleaning first.
Contact time: the step most people skip
Every disinfectant has a contact time (sometimes called dwell time): how long the surface must stay wet for the product to work. It is printed on the label and can range from under a minute to several minutes, depending on the product and the germs it targets.
If you spray and immediately wipe dry, you have cleaned the surface but not disinfected it. To get it right:
- Read the label for the contact time and the correct dilution.
- Apply enough product to keep the surface visibly wet for the full time.
- Let it air-dry where practical, or wipe after the time is up.
- Rinse chopping boards, worktops and high chairs with clean water afterwards if the label advises it.
When disinfecting is worth it
Disinfecting the whole house every day is unnecessary for most households, and overusing strong chemicals can irritate skin and lungs. Save it for situations where the risk is genuinely higher:
- Illness in the home, especially sickness bugs, or when someone has a weakened immune system.
- Raw meat, poultry, fish or eggs have touched a worktop, board, sink or tap.
- Toilets and the surfaces around them, including the seat, flush handle and nearby floor.
- Flooding or sewage leaks, where water has touched floors, cupboards or food areas.
- Pet accidents on hard floors, after the mess has been cleaned up.
The rest of the time, regular cleaning of high-touch points does the heavy lifting: door handles, light switches, taps, fridge handles, remote controls and phones.
Room by room: what each area needs
Kitchen
- Clean worktops with hot, soapy water after cooking and wipe them dry.
- Disinfect anything that has touched raw meat or poultry, including the sink and tap handles.
- Use separate chopping boards for raw and ready-to-eat food, and put them through a hot dishwasher cycle where they are dishwasher safe.
- Wash dishcloths at 60°C or replace them often, and let sponges dry out between uses. A damp cloth spreads germs across every surface it touches.
- Clean inside the fridge regularly and wipe up spills straight away.
Bathroom
- Clean the basin, bath, shower and toilet weekly, working from the cleanest areas to the dirtiest.
- Disinfect the toilet seat, lid, flush handle and taps, particularly when someone is ill.
- Keep a separate cloth or colour-coded cloths for the toilet so it never touches the basin.
- Ventilate after showers to reduce the damp that allows mould to grow.
Bedrooms and living areas
Here the bigger issue is usually allergens rather than germs: dust mites, mould spores and pet dander. Disinfectant spray does little against these. What helps:
- Damp-dust weekly so particles are trapped rather than thrown back into the air.
- Vacuum carpets, rugs and upholstery at least once a week, ideally with a HEPA filter.
- Wash bedding at 60°C where the care label allows, which kills dust mites.
- Reduce clutter, open windows daily and keep humidity down to discourage mould.
- Have carpets deep cleaned periodically, as vacuuming alone cannot lift everything trapped in the fibres.
Using cleaning products safely
- Never mix products. Bleach mixed with ammonia, or with acids such as vinegar and many limescale and toilet cleaners, releases toxic gases. Use one product, rinse, then use the next.
- Ventilate. Open windows or run an extractor fan. Strong products can trigger asthma and headaches.
- Protect your skin and eyes. Wear rubber gloves, and eye protection when using bleach or spraying at head height.
- Dilute as directed. Stronger is not better: over-concentrated bleach is harsher on you and your surfaces without working any better.
- Test first. Bleach and some disinfectants can mark natural stone, fabrics and some metals, so check the label and try a hidden spot.
- Store safely. Keep products in their original containers, sealed, and out of reach of children and pets.
How professional cleaners approach hygiene
When our teams carry out a deep clean or an end of tenancy clean, the same principles apply: remove the grime first, then give the right product enough time on kitchen and bathroom surfaces and high-touch points. Professional products and equipment are included, and every room and item is listed on your itemised quote. You can see what is covered in our cleaning checklist.
These are real totals from our deep cleaning jobs in the last 12 months:
| Property / booking | From | Average | Jobs |
|---|---|---|---|
| Studio flat | £155 | £322 | 25 |
| 1 bedroom | £175 | £309 | 261 |
| 2 bedrooms | £207 | £317 | 438 |
| 3 bedrooms | £265 | £420 | 299 |
| 4 bedrooms | £375 | £532 | 120 |
| 5+ bedrooms | £511 | £716 | 28 |
Real job totals from the last 12 months, updated 12 October 2026. “From” is the price the cheapest 10% of jobs came in at; “Average” is the typical total. Your quote depends on size, condition and extras.
Full details for every service are on our prices page.
FAQs
Is cleaning enough, or do I need to disinfect every day?
For most homes, regular cleaning is enough. Disinfect in specific situations, such as when someone is ill, after raw meat has been prepared, and on toilets and the surfaces around them.
What is the difference between sanitising and disinfecting?
Sanitising reduces germs to a level considered safe, and is often used on food-contact surfaces. Disinfecting is stronger and kills most bacteria and viruses on a hard surface, provided it stays wet for the contact time.
Why does my disinfectant not seem to work?
The two usual reasons are wiping it off too soon and spraying it on a dirty surface. Clean first, then leave the product wet for the full time stated on the label.
Can I mix cleaning products to make them stronger?
No. Mixing bleach with ammonia or with acidic cleaners can release dangerous gases. Use one product at a time, rinse in between and keep the room ventilated.
Would you rather leave the deep work to a professional team? Get Free Quote for an itemised price, or Book Online for any day, Monday to Sunday, 8am to 7pm.