In infection control, which practice is considered most effective in preventing contamination when hands are visibly dirty?

• A. Using hand sanitizer
• B. Hand washing with soap and water
• C. Wearing gloves
• D. Wearing a mask

Answer: (B)

When hands are visibly dirty, washing with soap and running water is the most effective way to prevent contamination. Soap helps lift and remove dirt, organic material, and microbes from the skin, and rinsing washes them away so they don’t stay on the hands. Hand sanitizer, while useful on clean hands, can’t remove visible soil and isn’t as reliable when hands are dirty, because the dirt can block the sanitizer from contacting microbes and some pathogens may resist it. Wearing gloves or a mask can help reduce risk, but they don’t replace the need for proper hand hygiene; gloves can become contaminated and should be changed and hands washed before and after use. So the best practice in this situation is to wash with soap and water, thoroughly: wet, lather, scrub for about 20 seconds, rinse, and dry completely.