1, the water temperature used to wash the bottom should be appropriate, generally around 36-37 degrees Celsius. Try it with your hands first, and you won't feel hot.

2. Wash your ass with a soft towel or gauze, wipe it clean after each wash and dry it in the sun.

3. Top-down flushing, that is, flushing the urethra first, and then flushing around the anus to prevent bacteria in the anus from polluting the urethral orifice. This is especially important for girls, because the urethral orifice of women is close to the anus and is more susceptible to infection.