Question from J in Va
Hi Debra, I am interested in learning more about disinfecting with sunshine. I have a few questions: Does sunshine just disinfect clothing/fabrics or is it useful on other objects as well (i.e. plastic, books, etc). How long does something need to be in the sun? Does it need to be outside or is through a window also effective? Does sun disinfect against cold/flu/stomach viruses? Thanks for everything. Your website provides very useful info.
Debra’s Answer
Well, here is a reference I found on the subject.
SF Gate: Natural Alternatives to Bleach for Disinfecting
Perhaps the most surprising natural disinfectant is sunlight. Ultraviolet radiation of the sun kills pathogens that cause diarrhea. In fact, scientists have found that exposing a bottle of water to sunlight for 6 hours is an economical way to provide developing countries with safe drinking water (see References 2). The disinfecting properties of sunlight can also be useful around the house. If you have an object that you can move outside, the sun’s rays can help disinfect it. A stained piece of white laundry can be effectively brightened and disinfected by spraying the stain with lemon juice or vinegar and then hanging it in the sun (see References 1).
1. Idaho Department of Health and Welfare: Safe Alternatives to Hazardous Household Chemicals
2. “Environmental Science and Technology”; Solar Disinfection of Drinking Water in the Prevention of Dysentery in South African Children Aged Under 5 Years: The Role of Participant Motivation; Martella du Preez, et al.; October 2010
I think that answered all your questions.
