How to Prevent a Fogging Dive Mask
Written by Mario Medarevic
Published on Diveworld.ca
Few things are more frustrating than a fogged-up dive mask. Whether you’re gearing up for your first open water dive or prepping for a trip to Tobermory, mask fog can distract, annoy, and even cut dives short.
Luckily, there are proven ways to stop your mask from fogging—whether it’s brand new or just giving you trouble on a particular day. Here’s a breakdown of why fogging happens, and what you can do to prevent it.
Why Dive Masks Fog
Dive masks fog up when moisture inside the mask condenses on a cool lens surface. The key culprit? Residue or contamination on the inside of the mask lens, which gives the condensation something to cling to.
This residue can come from:
-
Manufacturing coatings (in new masks)
-
Natural skin oils
-
Sunscreen
-
Dirt or dust
-
Improper cleaning
Let’s look at how to deal with each of these.
New Mask? You Need to Remove the Manufacturing Residue
Brand-new masks come coated in a thin layer of manufacturing silicone or film that causes persistent fogging, even if you defog the mask normally. Left alone, this layer naturally wears away after 10–20 dives—but most divers prefer not to wait that long.
✅ Quick Fix: Use Toothpaste
Here’s how to break in your new mask faster:
-
Apply a dab of white (non-gel) toothpaste to the inside of the lenses.
-
Spread it thoroughly across the entire surface using your fingers.
-
Leave it overnight to allow the mild abrasives to degrade the residue.
-
Rinse thoroughly the next morning.
Repeat if necessary. This process won’t damage the lens, but it will significantly reduce fogging.
Daily Fogging? Oils, Dirt, or Sunscreen Might Be the Problem
Even with a broken-in mask, you might notice fogging on some days but not others. This is usually due to contaminants on the lens surface—most commonly finger oils or sunscreen transferred while handling your mask.
✅ Simple Solution: Wash with Soap or Baby Shampoo
To clean your mask lenses before a dive:
-
Rinse with fresh water.
-
Apply a small drop of baby shampoo or mild soap to the inside.
-
Rub gently and rinse well.
Why baby shampoo? It’s gentle on your eyes in case any residue is left behind, and it acts both as a cleaner and a defogger.
Still Fogging? Try the “Burn Method” (With Caution)
If you’re really impatient—or you want to guarantee the residue is gone—there’s a more aggressive method some divers swear by:
🔥 The Flame Technique
-
Take a lighter (standard Bic is fine).
-
Hold the flame near the inside of the lens surface, being very careful not to touch the silicone skirt.
-
Move the flame evenly across the lens until you see soot or discoloration.
-
Let it cool, then wash the soot away with soap and rinse well.
This burns away the manufacturing film instantly, but it must be done carefully to avoid damaging your mask.
⚠️ Note: Do not attempt this on masks with plastic lenses or prescription inserts. And always avoid contact with the silicone skirt.
Pro Tips to Keep Your Mask Fog-Free
-
Spit still works: Once your mask is clean, a quick spit and rinse before your dive is often enough to prevent fog.
-
Avoid touching the inside of the lens once cleaned.
-
Store your mask dry and clean to avoid buildup of oils or residue.
-
Re-clean with baby shampoo if you notice fogging return unexpectedly.
Conclusion: A Clear View Is a Better Dive
Foggy masks are a hassle—but with the right prep, they’re 100% avoidable. Whether you go with toothpaste, baby shampoo, or the flame method, just remember the goal is the same: clean lenses, minimal residue, and proper prep right before you dive.
Got questions about dive gear or want to try out new masks in person? Visit us at DiveWorld.ca or stop by our Etobicoke shop. We’ll help you find the right gear and get it dive-ready.