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The proper handwashing technique is essential for preventing the spread of pathogens and ensuring food safety. Washing hands with soap for at least 20 seconds under warm running water is effective because warm water helps to dissolve the soap and remove dirt and contaminants from the skin. The friction created by rubbing hands together is also crucial, as it physically dislodges germs and debris from the skin's surfaces, making the washing process more effective.

Using warm water enhances the overall experience and encourages more people to wash their hands thoroughly and for an adequate duration. The 20-second guideline is widely recommended by health authorities, as it provides enough time to ensure that all areas of the hands, including between the fingers and under the nails, receive proper attention.

Shorter washing times, such as 10 seconds, may not be sufficient to effectively remove germs, and washing with cold water may not be as effective as using warm water. Additionally, while drying is important after washing, rubbing dry is not part of the handwashing technique itself but rather a separate step after ensuring the hands are clean.