Before applying disinfectants, what initial step should be performed on a surface?

• A. Clean the surface
• B. Apply disinfectant directly
• C. Wipe with a dry cloth only
• D. Ignore the surface

Answer: (A)

Cleaning the surface first removes dirt, oils, and organic matter that can shield microbes and interfere with disinfectants. Disinfectants work best on a clean surface, where they can contact and inactivate remaining organisms effectively. After cleaning, apply the disinfectant according to the label directions and allow the required contact time. Wiping with a dry cloth or applying disinfectant directly to dirty surfaces won’t adequately remove soil and can reduce effectiveness, and ignoring the surface isn’t acceptable.