Steamed-up mirror: easy tips to stop the fog

Why does the bathroom mirror steam up?

When you shower with hot water, the bathroom air fills with steam, heat, and a large amount of invisible moisture. The mirror, however, tends to stay cooler because it retains the ambient temperature of the room. When the warm, moist air comes into contact with that cold surface, an immediate change occurs: the moisture cools rapidly and turns from being suspended in the air into tiny droplets of water. These tiny droplets cling to the glass and form a thin film covering the mirror. That layer is what causes the glass to fog up, stopping you from seeing your reflection right after a shower.

The best household remedies to stop your mirror steaming up

There are various household remedies to stop a mirror steaming up, but the longest-lasting trick is to use shaving foam. Simply spread a thin layer over the whole glass and wipe it off straightaway with a clean microfibre cleaning cloth until it comes to a shine. This leaves an invisible film that stops water droplets from clinging, and the effect lasts up to two weeks.

If you want a quicker solution, hand soap or washing-up liquid work brilliantly. Put a single drop on a dry cloth and rub the mirror until any residue disappears and it is left clean. The soap breaks the surface tension of the water and makes moisture run off rather than build up.

Commercial products to help keep your mirror clean and clear

To keep the mirror spotless and fog-free without using household tips, there are also some specific liquids and sprays designed to prevent fogging, many of which are also used on car windows. They are applied by spraying a small amount onto the clean mirror and wiping with a dry cloth. These products create an invisible protective film on the glass that stops moisture from building up, keeping the surface clear for weeks with a single application.

Ventilation tips to reduce humidity in the bathroom

To reduce humidity in the bathroom, the most effective approach is to ventilate before, during, and after your shower. While showering, it’s a good idea to leave the window slightly open so the steam gradually escapes, and keep the door closed so the moisture doesn’t spread through the rest of the house. Once you have finished your shower, open the window fully and, if possible, also open the window of a nearby room to create cross-ventilation and refresh the air in minutes.