How to Defog Your Scuba or Snorkel Mask

Diving isn't fun if you can't see anything!

Have you ever wondered why your scuba/snorkel mask always seems to fog up even if you use a defogging spray or the old toothpaste, dish soap, and/or spit method? There are very simple, easy, and FREE ways to ensure that your mask won't continue to fog up. This is not only annoying but can be potentially dangerous during a dive.

One reason your mask may be fogging up is that most of us don't know that when you purchase a new mask that it has a protective silicone film on the inside that has to be removed. Once you have safely removed the film, you can take additional steps to prevent fogging during your time in the water.

Here are some tips on how to defog your scuba or snorkel mask:

Though there are many options for how to defog your scuba or snorkel mask, these 5 simple tips are all you need to ensure that your mask stays clear throughout your time in the water!

Tip #1

With all the methods that we suggest, your mask needs to be completely dry before any treatment!

Tip #2

Because your mask is made of tempered glass, it's important to continuously move the flame while you are burning it, avoiding getting too close to the silicone/rubber as it will melt.

• Keeping the flame too long in the same place might cause the surface to break.

• Keep the mask away from your face, and as an extra precaution, use protective eyewear in case it does break.

• It might be necessary to repeat the burning process more than once.

Here is how to remove the protective film when your mask is brand new:

Tip #3

Use a soft towel to wipe away the black soot. DO NOT rinse in water until it has completely cooled, or it will cause it to shatter.

Tip #4

Before each use, especially after a long period of non-use, it's a good idea to coat your mask with white toothpaste, let it dry for a couple of hours, and then wash with gentle dish soap.

Tip #5

Instead of buying expensive commercial defoggers, there is an inexpensive DIY (DO It Yourself) solution! Find any spray bottle (you can reuse one that you already have as long as you thoroughly clean it beforehand) and fill it with 10% dish soap and the rest with water. Pack this with your gear and apply and rinse your mask before entering the water.

How to defog your mask underwater:

1. Why does my scuba or snorkel mask fog up?

Mask fog happens when warm air inside the mask meets cooler water outside. Moisture condenses on the lens, creating that blurry fog layer that makes it hard to see underwater.

2. What’s the best method to prevent mask fogging?

The most reliable method is to clean a new mask with toothpaste, then use a commercial defog solution or spit before every dive. Proper prep prevents 99% of fogging problems.

3. Can I use baby shampoo as defog?

Yes! Baby shampoo (diluted with water) is a popular, gentle, reef-safe alternative to store-bought defog. Just avoid overly scented or chemical-heavy formulas.

4. Why shouldn’t I touch the inside of the lens?

Touching the inside of the mask leaves oils from your fingers, which create streaks that worsen fogging. Always rinse—never rub.

5. What should I do if my mask fogs during a dive?

Let a small amount of water into your mask, tilt your face downward, and gently swish to clear the lens. Then reseal the mask and continue your dive.

If you are having issues with the fit of your mask, watch the video below!

Do you have any tips to share?

Put them in the comments below!