After washing your hands, which method is not permitted for drying your hands?

Using your shirt or apron to dry your hands is not permitted because it poses a risk of cross-contamination. Clothing, including shirts and aprons, can harbor bacteria and other contaminants. When hands are dried on clothing, there's a chance that those contaminants can transfer back onto the hands or onto surfaces that may come into contact with food. Proper handwashing procedures emphasize the importance of using methods that minimize the risk of contamination.

In contrast, the other methods mentioned—such as using paper towels, a hot air machine, or air drying—are acceptable because they effectively remove moisture without introducing additional contaminants. Paper towels are particularly useful as they can also serve to wipe down surfaces, while hot air machines and air drying methods are recognized for their ability to dry hands without physical contact with potentially contaminated surfaces.