Cleaning removes dirt, debris and many germs from surfaces using soap or detergent and water. Sanitizing reduces the number of bacteria on a surface to levels considered safe, using a product registered for that purpose. Disinfecting kills the specific viruses and bacteria listed on an EPA-registered disinfectant's label, but only when the product is used as the label directs, including leaving the surface wet for the stated contact time. Cleaning usually comes first, because dirt can block sanitizers and disinfectants from working.
The official definitions
The EPA and CDC use these terms carefully:
| Term | What it does | Product type | Regulator |
|---|---|---|---|
| Cleaning | Removes soil and many germs from surfaces | Soap, detergent, general cleaners | Not registered as pesticides |
| Sanitizing | Lowers bacteria on surfaces to safer levels | Sanitizer registered with EPA for that use | EPA (pesticide registration) |
| Disinfecting | Kills specific germs listed on the label | EPA-registered disinfectant | EPA (pesticide registration) |
Because sanitizers and disinfectants kill microorganisms, the EPA regulates them as pesticides and requires label claims to be supported. That is why the label matters so much.
Why "contact time" is everything
Every EPA-registered disinfectant lists a contact time, also called dwell time: how long the surface must stay visibly wet for the product to kill the listed organisms. It can range from seconds to several minutes depending on the product and organism.
Spraying a disinfectant and wiping it off immediately often does not disinfect. It mostly cleans. When a vendor says it "disinfects," ask:
- Which product, and is it EPA-registered?
- Which organisms does the label claim?
- What is the contact time, and how does the team make sure it is met?
- Does the surface need cleaning first, or is it a one-step cleaner-disinfectant?
- Does the label require rinsing on food-contact or child-contact surfaces?
When each is appropriate
The CDC's facility guidance says that in most everyday settings, routine cleaning is enough to remove most germs, and that disinfecting is warranted in higher-risk situations, such as when someone in the space is sick or in settings with vulnerable people.
| Setting | Typical approach |
|---|---|
| General office surfaces (desks, walls) | Cleaning |
| Office touchpoints (handles, switches, restroom fixtures) | Cleaning, with disinfecting on high-touch and restroom surfaces |
| Restrooms | Cleaning plus disinfecting fixtures |
| Breakroom food-contact surfaces | Cleaning, with sanitizing per food-safety guidance |
| Medical patient areas | Cleaning and disinfecting with products the practice approves |
| Childcare | Cleaning, sanitizing and disinfecting per licensing standards and product labels |
| During illness outbreaks | More frequent disinfecting of touchpoints |
Why over-disinfecting is not better
More disinfectant is not always safer. Disinfectants are chemicals with label precautions, and overuse can irritate skin and airways, damage surfaces and waste money. Using the right approach for the setting, and following labels, is better than spraying everything.
How to read a disinfectant label
- EPA registration number, confirming it is registered
- Use sites, such as hard nonporous surfaces or food-contact surfaces
- Organisms claimed and their contact times
- Directions: pre-cleaning, dilution, application, rinse requirements
- Precautions and required PPE
The EPA maintains lists of registered disinfectants for specific pathogens, which can help you confirm a product's claims.
In practice: a typical janitorial program
In a typical office, a janitorial team cleans most surfaces, disinfects restroom fixtures and frequently touched surfaces with a registered product used per its label, and leaves food-contact surface sanitizing to food-safety procedures. In medical offices, products and surfaces are agreed with the practice, and clinical surfaces stay with clinical staff. In childcare centers, much daytime sanitizing is done by staff under licensing standards, with our team handling nightly cleaning and agreed tasks.
Related guides
- Medical office cleaning checklist
- OSHA bloodborne pathogens and medical office cleaning
- Commercial cleaning glossary
Frequently asked questions
Is sanitizing the same as disinfecting?
No. Sanitizing reduces bacteria to safer levels. Disinfecting kills the specific organisms listed on an EPA-registered disinfectant's label when used as directed.
Do I need to clean before disinfecting?
Usually yes. Dirt and residue can block disinfectants. Some one-step products clean and disinfect, but only if the label says so.
What is disinfectant contact time?
The length of time a surface must stay wet with the disinfectant for it to kill the organisms listed on the label.
Should offices be disinfected every night?
Most office surfaces only need cleaning. Restroom fixtures and frequently touched surfaces are commonly disinfected routinely.
Sources
Published · Updated · Northmark Facility Services.