Yes, disinfectants can expire. The expiration date indicates the period during which the product is expected to be effective when used according to the label instructions. After the expiration date, the disinfectant’s active ingredients may degrade, making it less effective at killing germs, bacteria, and viruses.
Store-bought disinfectants
In most cases, store-bought disinfecting products have a year-long shelf life. The one-year of effectiveness typically begins with the manufacture date. There’s no actual “best by” date on some of your store-bought disinfectants so you should be able to find to find the manufacturing date. Then, add a year.
DIY bleach solutions
Store-bought disinfectants aren’t the only thing you need to keep tabs on. But your DIY products, too! For example, while it’s important to dilute bleach with water before using it to disinfect, keep in mind bleach is less stable in its diluted form — which means temperature, light, or contamination can cause it to degrade within hours or days. It’s unlikely, that the solution would become unsafe to use, but it will probably become less effective the longer it sits.
Alcohol-based hand sanitizer
It’s probably unlikely you still have hand sanitizer left over from a few years ago, but those expire, too. The alcohol, the active ingredient in most forms of hand sanitizer, evaporates when it’s exposed to the air, which starts happening as soon as the bottle is open. Most hand sanitizer bottles aren’t air-tight, so the effectiveness will dwindle over time, ultimately bottoming out at around three years. Again, your expired sanitizer probably won’t hurt you, but it’s worth replacing if it’s not going to stave off potentially harmful pathogens. When in doubt, opt for hand-washing with soap and water instead — it’s always better to be safe than sorry!
For most disinfectants, the expiration date is usually printed on the bottle or packaging. It’s important to check and follow these dates to ensure you’re using a product that will perform as expected. If you’re using an expired disinfectant, it might not provide the level of disinfection needed, potentially leaving harmful microbes behind.
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