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SESK: Stuff Everyone Should Know · sesk.info/scuba-mask-defog

What is a standard way to stop a dive mask from fogging?

Use defog or dilute baby shampoo before the dive.

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  1. Use defog or dilute baby shampoo ✔
  2. Keep the mask dry
  3. Breathe through your nose

Why: Mask fog is moisture condensing on the lens. Commercial defog, or a few drops of baby shampoo diluted in water, coats the lens: spray, swish and rinse.

Huh, didn't know that: Many divers use spit as a free defog: spit, swish and rinse.

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Why did the mask stay clear? It had a bright outlook.
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References

Answer: Use defog or dilute baby shampoo. Mask fog is moisture condensing on the lens. Commercial defog, or a few drops of baby shampoo diluted in water, coats the lens: spray, swish and rinse.

  1. PADI Blog: Tips for Preventing Mask Fog blog.padi.com/tips-for-preventing-mask-fog
    Dilute a few drops of baby shampoo in water and pour it into a spray bottle.
    Checked 2026-10-12.
  2. PADI Gear: Masks www.padi.com/gear/masks
    Before every dive, apply a defog solution to your mask lens.
    Checked 2026-10-12.

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