Cleaning a foggy wall mirror can be quite simple with a few steps. Firstly, wipe down the mirror with a clean, dry cloth to remove any loose dust or dirt particles. Next, spray a small amount of glass cleaner onto the mirror, and use a soft cloth to wipe the surface in a circular motion. Alternatively, you can mix equal parts of vinegar and water in a spray bottle and use it as a cleaning solution.

To prevent the mirror from fogging up in the future, you can try using a commercial anti-fog spray or applying a small amount of shaving cream to the surface of the mirror and then wiping it off with a clean, dry cloth. This can help to create a barrier that prevents fog from forming.

It is also important to note that excessive moisture and humidity in the bathroom can contribute to a foggy mirror. To reduce the moisture level in the bathroom, ensure that the ventilation fan is properly functioning, and keep the bathroom door open after using it to allow air to circulate.