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4 Effective Ways to Defog Your Scuba Diving Mask


How to defog a dive mask

If you've recently invested in a new scuba diving or snorkelling mask, the first thing you need to do is prepare it properly. This guide will walk you through the two types of mask preparations: an initial preparation for brand-new masks and a quick preparation before every dive.


Why Prepare Your Mask?

Brand-new masks fog up quickly due to the residue left from the manufacturing process. This residue promotes condensation, which can ruin your dive experience. The cold water outside the mask and the warm air inside creates the perfect environment for fogging. Preparing the mask involves removing this residue and preventing condensation.

How To Prepare A New Dive Mask #scuba 

Exceptions to Consider

  • Plastic Lenses: If your mask has plastic lenses, avoid these preparations as plastic lenses scratch easily.
  • Tempered Glass Lenses: Most dive masks are made with tempered glass lenses, which are durable and require preparation.
  • Coated Lenses: If your mask has any special coating, consult the manufacturer for the best preparation method to avoid damaging the lens.

Preparation Methods

  1. Defog Films
    • Self-adhesive films that stick to the inside of your lens.
    • Requires a clean lens and careful placement.
    • Offer low maintenance and good defogging performance.
  2. Commercial Mask Cleaners
    • Use products specifically marketed as mask cleaners, not defog sprays.
    • Apply a small amount, rub gently, and rinse.
    • Multiple treatments might be needed for best results.
  3. Toothpaste
    • Use non-abrasive, basic white toothpaste.
    • Rub it onto a dry lens, let it dry, and then wipe it off.
    • Test for fogging and repeat as necessary.
  4. Fire (Not Recommended)
    • Some divers use a lighter to burn off the residue.
    • It can damage the mask and affect the tempering of the glass.
    • Not recommended by most manufacturers.

Defogging Before Each Dive

  • Spit: A traditional method, though less popular post-COVID.
  • Commercial Sprays and Gels: Apply to a dry mask and rinse if needed.
  • Baby Shampoo/Dish Soap: Dilute and apply with a spray bottle. No rinsing required.
  • Cooling Your Face: Splash water on your face to prevent fogging.

If your mask fogs up during the dive, let a small amount of water in, rinse the inside, and clear it by exhaling through your nose.


By following these preparation methods, you can enjoy a clear, fog-free diving experience. Happy diving, everyone!

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Picture of Mark Newman
Mark Newman
A former SCUBA Dive Instructor, I learnt to dive in the UK and taught both here and abroad. After that I spent a lot of time working with dive equipment from all of the major brands. From the Arctic Circle to the Tropics and Apnea to Closed Circuit, most of my professional life has been spent in the scuba diving industry.
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