How to permanently prevent the bathroom mirror from fogging?

Apply soap or detergent to the mirror. Evenly apply soapy water or detergent to the mirror surface, and then wipe it clean. Because both soapy water and detergent contain surfactants, it can effectively prevent water vapor from condensing into water droplets on the mirror surface and achieve the purpose of anti-fog.

Two:

Replace the mirror with anti-fog effect

In a treasure, you can buy a mirror with anti-fog function.

The principle of this kind of anti-fog mirror is that a heatable film of composite resistance wire is attached behind the mirror. When heating is needed, turn on the heating switch, and the heating wire stuck behind the mirror will start to work. The temperature of the glass will rise, the water vapor condensed on the mirror will evaporate, and the mirror will brighten again!

Three: sticking an anti-fog film on the mirror another way to change the performance of the mirror-sticking an anti-fog film. This film is essentially an anti-riot film, which is essentially the same as the film attached to the car glass when we buy a car. However, the anti-fog film is made of transparent PET, which ensures the air permeability of the film. Then the surface of the film is specially treated and coated with scratch-resistant layer and anti-fog layer. Generally, there are two ways to achieve waterproof and anti-fog effect: one is hydrophobic, and the surface is coated with a hydrophobic layer, so that water drops on the surface and will slide down quickly; The other is coated with a hydrophilic layer. When water vapor condenses on the surface, it will spread out on the surface to form a uniform layer instead of forming small water droplets. Because the particles condensed by water mist are very small, hydrophilic anti-fog film has better effect on mirror surface than hydrophobic one. At the same time, in order to ensure the smoothness of mirror glass, ordinary float glass is used instead of tempered glass. The PET substrate of anti-fog film has a certain strength, which can prevent sharp corner glass from protruding and glass slag from splashing when the mirror is accidentally broken, and ensure your safety in use.