How do I keep my bathroom mirror fog free?

Keeping your bathroom mirror fog-free comes down to a few simple strategies, and most of them require no renovation work at all.

The easiest solution is proper ventilation. Run your bathroom exhaust fan during your shower and for at least 15-20 minutes afterward. Many homeowners turn the fan off when they leave the bathroom, but the real moisture removal happens in those minutes after your shower ends. If your fan is older or undersized, it may not be moving enough air to make a real difference.

Anti-fog mirror coatings and sprays are another quick fix. Products like Rain-X or dedicated mirror defoggers create a thin hydrophilic layer on the glass that prevents water droplets from forming. You apply them like a spray cleaner, buff them in, and they typically last a few weeks before needing reapplication. It's a $10-15 solution that works surprisingly well.

The most permanent solution is a heated mirror or a mirror with a built-in demister pad. These are electric heating elements that mount behind the mirror and keep the glass surface just warm enough that condensation never forms. They're wired into your bathroom electrical and run on a timer or switch. In Ottawa, any new electrical work in a bathroom requires proper permits and should be done by a licensed electrician — this isn't a DIY project.

For day-to-day use, a quick wipe with shaving cream (then buffed clear) is an old contractor trick that actually works — the glycerin in the foam leaves a thin anti-fog film on the glass.

If your fogging problem is severe, it may point to an undersized or failing exhaust fan, which is worth addressing properly. A correctly sized fan for your bathroom square footage makes a noticeable difference in moisture control, mold prevention, and overall air quality. Want to discuss upgrading your bathroom ventilation or fixtures? Ottawa Bathrooms offers free consultations.