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How To Defog Your Bathroom Mirror

Lowe's Editorial Team

By Lowe's Editorial Team
Updated March 11, 2025

As comforting as a hot shower is, it will leave your ​bathroom mirror frustratingly foggy. But there are some effective methods to prevent foggy mirrors. Here’s some expert advice on how to defog bathroom mirrors.

Easiest Ways to Defog Bathroom Mirrors

Let’s begin with some basic methods:

  • Provide​ Ventilation: The ​humidity condenses on the cold mirror. That’s why it fogs up. If possible, open the windows or door of your bathroom to allow the warmth and moisture to escape.
  • Run a cold shower: ​Before stepping into a hot shower, turn on the cold water for a minute to cool the bathroom air. Doing this will lower the temperature difference that causes fogging on the mirror.

DIY Solutions for Fog-Free Bathroom Mirrors

Looking for a more proactive approach? Try these DIY methods to keep your mirror clear:

  • Soap: This is a quick and easy trick. Rub a thin layer of soap over the mirror's surface. Wipe off the residue with a clean, dry cloth. The soap leaves a microscopic film that acts like a barrier for fog.
  • Shaving Cream: Like soap, apply some shaving cream on the mirror and buff off the excess. This method lasts for several showers.
  • Vinegar: Mix equal parts white vinegar and water. Spray the solution on to the mirror and wipe it off with a microfiber cloth. The vinegar's acidic properties help prevent fogging for up to a week.

Professional Methods to Defog Mirrors

For a permanent solution, look at these professional options:

  • Install an exhaust fan: A well-functioning exhaust fan removes a great deal of humidity from your bathroom. This is a great long-term investment for a fog-free shower experience.
  • Use w​ater repellent spray: These products are normally used for car windshields but they are safe to use on bathroom mirrors too. They create a water-repellent barrier, preventing fogging. They require reapplication every few months.
  • Use a h​eating pad: This is an adhesive pad that sticks to the back of your mirror. It connects to a power source that generates heat to keep the mirror warm enough to prevent fog.
  • Install a f​og-free mirror: The most permanent solution is to invest in a fog-free mirror. These mirrors have a built-in heating element that keeps the surface warm. It eliminates fogging entirely.

How to Clean a Foggy Mirror

Even with preventative measures, your mirror may still fog up at times. Here's how to clear it quickly:

  • Hair Dryer: If you keep a hairdryer in your bathroom, this is your best bet. Turn on your hairdryer on the ‘cool’ setting. Hold it a few inches away from the mirror and gently blow away the condensation. This is a fast and efficient method to regain a clear view.
  • Wipe Down: If a hairdryer isn't readily available, wipe the mirror with a clean, dry cloth. This will remove the moisture droplets and restore clarity. It isn't the best option as a cloth will leave streaks.

Keeping a Clean Mirror

Fog-free bathroom mirrors look presentable and last longer. Mineral deposits cause hard water stains and soap scum buildup holds onto moisture. This creates a film that leads to frequent fogging, so make sure you clean your mirrors regularly. Wipe them down with a glass cleaner and a paper towel to get a streak-free surface.

That’s all that you need to know about defogging bathroom mirrors. Pick what works best for you. If you’re looking for a quick way to upgrade your bathroom vanity, check out our bathroom mirror guide.

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