Which of the following is true regarding the use of soap in hand washing?

The statement regarding proper handwashing requiring at least 20 seconds of scrubbing with soap is accurate because effective hand hygiene is crucial in preventing the spread of infections. During the 20 seconds of scrubbing, the soap works to break down oils and dirt on the skin, and mechanical friction helps to lift away germs. This duration allows for thorough cleaning, ensuring that areas often missed, such as between the fingers and under the nails, are properly cleaned.

In contrast, not all soaps are equally effective at killing germs—some may simply help lift dirt without having specific antimicrobial properties. The application of soap should be done on wet hands rather than dry, as water activates the soap and aids in the cleaning process. Finally, rinsing is not optional; it is essential to wash away both the soap and the loosened germs to complete the handwashing process effectively. Thus, adhering to the 20-second scrubbing guideline is an important practice in maintaining good hygiene.