Some people use dish soap to wash fruit. If not rinsed thoroughly with tap water, the dish soap is likely to remain in the stomach, and its accumulation over time can be harmful to health.
When washing fruit, you can choose to use salt. After wetting the fruit's surface with water, sprinkle a little salt, then gently rub the apple back and forth with both hands. The surface dirt will be cleaned off quickly. Then, rinse it with water, and it's safe to eat. The principle behind this method is that the granules of salt increase friction, and salt is also very clean.
Additionally, applying toothpaste to the apple's surface as a cleaner is also a very effective method. Washing the apple with hot water is also a great way to easily remove preservatives and other substances from its skin. The fruit washed this way can then be eaten with peace of mind.