Cleaners, sanitizers and disinfectants: what the label words mean

The shelf of cleaning sprays in any supermarket uses three words as if they were interchangeable: clean, sanitize, disinfect. On a US label they are not interchangeable at all. Each describes a different job, two of them are claims that a regulator has to accept before they can be printed, and the small print that comes with them changes how you should use the bottle.

I find this easiest to understand as a table first, then a label read line by line, then the questions people tend to ask once they start looking.

The three jobs side by side

The definitions in that table come from two US federal sources. The CDC describes cleaning as removing most germs, dirt and impurities from surfaces, sanitizing as reducing germs to levels public health codes or regulations consider safe, and disinfecting as killing most germs on surfaces and objects. The EPA's own wording is a little more precise: a sanitizer reduces, but does not necessarily eliminate, microorganisms, and a disinfectant destroys or irreversibly inactivates bacteria, fungi and viruses on nonliving surfaces, though not necessarily bacterial spores.

The important line in the table is the one about the regulator. Under US federal rules, a product sold with a claim that it destroys or controls pests counts as a pesticide and must be registered with the EPA, and germs on surfaces count. So the moment a spray says "kills 99.9%" of anything, it is a pesticide label, with pesticide rules. A plain cleaner that makes no germ claim is not.

Finding the EPA registration number

On any US sanitizer or disinfectant, look for the letters "EPA Reg. No." followed by a number with dashes. The EPA calls this the only reliable way to identify a product, because the same product can be sold under several names by different companies.

The number has two or three parts. A two-part number, written in the style of 1234-12, is a primary registration. A three-part number, in the style of 1234-12-123, belongs to a distributor selling the same product under its own name. The EPA says these have the same chemical composition and the same efficacy as the primary product. If you are checking a product against one of the EPA's published disinfectant lists, the first two parts are what you search for. The EPA's page on selected registered disinfectants explains this and links to the lists.

A worked example: reading a disinfectant spray label

Here is a sample label for a made-up multi-surface disinfectant spray of the kind sold in US supermarkets. I read it from the top.

1. Product name and claims. "Kills 99.9% of bacteria and viruses." That is a germ claim, so I expect a registration number, and I treat everything else as pesticide labelling.
2. "KEEP OUT OF REACH OF CHILDREN", then the signal word, here "CAUTION". On a pesticide, Caution is the lowest of three steps, but it is still a hazard rating. (Our piece on Danger, Warning and Caution explains the ladder.)
3. "EPA Reg. No." with its number. Noted, in case I need to look the product up or tell someone exactly which product it is.
4. Precautionary statements. A short section headed "Hazards to Humans and Domestic Animals", often asking you to avoid contact with eyes and to wash hands after use.
5. Directions for Use. This is the section that turns the claim into a result, and it carries three things I look for every time:
   • where it may be used (for example, hard nonporous surfaces, and whether food-contact surfaces are included and what the label asks you to do afterwards);
   • how to use it (spray distance, whether to dilute, whether to pre-clean heavily soiled areas);
   • the contact time for each organism.
6. Storage and disposal. Usually "store in a cool, dry area away from children" and instructions for the empty container.

Then the line every US pesticide label carries: "It is a violation of Federal law to use this product in a manner inconsistent with its labeling." That sentence is why the directions matter more on a disinfectant than on an ordinary cleaner.

Contact time: the part most of us skip

The contact time, sometimes called dwell time, is how long the product has to stay on the surface to do what the label claims. The EPA is clear that the surface should stay visibly wet for the whole contact time. Its own example: if the label gives 10 minutes for a particular germ and the surface has dried after 5, more product needs to go on.

That changes how I use these sprays. A quick spray and an immediate wipe is cleaning with an expensive bottle. To disinfect, the steps are:

1. Clean the surface first. The CDC advises cleaning before sanitizing or disinfecting, with soap and water.
2. Apply the disinfectant as the label directs.
3. Leave it wet for the full contact time for the germ you care about. If the label lists several organisms with different times and you want all of them covered, go by the longest.
4. Then wipe, or rinse if the label asks you to for that surface.

The CDC also says that for most homes, sanitizing or disinfecting is likely not needed unless someone in the home is sick or at higher risk of getting sick. Regular cleaning covers most days.

Why more product is not better

A label's claims were reviewed for the product used the way the label describes. A stronger mix than the directions give is not a stronger promise. It is just more fumes in the room, more residue on the surface and more of the product on your hands. The same goes for using two products together to "boost" them: never mix one product with another, and never follow one with a different one on the same surface without rinsing as the labels direct. Bleach in particular has a list of products it must never meet, which our piece on what bleach must never meet covers in detail.

The CDC's advice for using these products at home is short and worth keeping: read and follow the label, wear the protective equipment it recommends, make sure there is good ventilation indoors, do not mix products, and store them out of reach of children and pets. Its page on when and how to clean and disinfect a home sets this out in full. I would add one thing: keep each product in its original bottle, because the label is the instruction sheet. Our guide to keeping chemicals in their original containers explains why.

And in Europe?

European labels do not use the US registration system. Under EU rules, a product that claims to kill germs is a biocidal product, governed by the Biocidal Products Regulation, Regulation (EU) No 528/2012. According to the European Commission, a biocidal product cannot be placed on the market or used unless it contains approved active substances and has itself been authorised. Individual EU countries handle authorisation for their own markets, and some products can be authorised at EU level.

For a reader, the practical habits are the same. A disinfectant label in Europe still tells you what it is for, how to use it and how long to leave it, and if the product is classified as hazardous, the CLP label on the same bottle carries the pictograms, the signal word and the precautionary statements. The words "sanitizer" and "disinfectant" may not appear with exactly the US meanings, so read the directions rather than the front of the pack.

Common questions

Is a disinfecting wipe the same as a disinfectant spray?

Not necessarily. A wipe that claims to kill germs is a registered product in its own right, with its own label, contact times and list of surfaces. Read the wipe's label rather than the spray's, and check that the surface stays wet for the time it gives.

Does "antibacterial" on a cleaner mean it disinfects?

Not by itself. On a US surface product, any claim to kill or control germs needs an EPA registration. Look for the registration number and the list of organisms and contact times on the label. If those are missing, treat it as a cleaner.

Can I use a disinfectant on a chopping board or a baby's high chair tray?

Only if the label lists food-contact surfaces, and then only as it directs, including any rinse step it asks for. If the label does not list them, do not use the product there.

Why does my disinfectant list different times for different germs?

Because each germ claim on a US label has to be backed by data the EPA has reviewed, and the time needed can differ from one organism to the next. The label is telling you which time goes with which germ.

If someone has been exposed

If someone may have swallowed a cleaning or disinfecting product, breathed in its fumes or splashed it on their skin or in their eyes, call your local emergency number or a poison center now, with the product or its label in hand. In the US, Poison Help is 1-800-222-1222. In the UK, call NHS 111, or 999 in an emergency. In the EU, call 112. If the person is unconscious, having trouble breathing or having a seizure, call 911, 999 or 112 straight away. If fumes are the problem, get everyone out of the room and into fresh air first, then call. Other contacts are on our official help page.

The most useful thing you can bring to that call is the label itself, and on a US disinfectant the registration number is the quickest way for anyone to know exactly which product it was.