Abyss Scuba Diving

How To Keep A Dive Mask From Fogging Up?


How to Keep a Dive Mask from Fogging up?

All divers have experienced fogged mask lenses. Regardless of whether you are scuba diving a wreck, a reef, or deep diving, this is a frequent problem that challenges all scuba divers at one point in time or another. This issue is often just a small annoyance but can turn into an inconvenience for having a fun, safe dive. No one wants to struggle with foggy lenses, just to surface and have your group tell you about the weedy sea dragon you missed because your mask was fogged up. That is why you will be so much smarter by understanding what leads to defogging of the mask and how you can keep a dive mask from fogging up.

Treating a New Dive Mask

No matter the quality of the mask, during the manufacturing process, a thin film of silicone oil condenses on the glass lens of your new dive mask. This oil will cause rapid fogging that is resistant to conventional anti-fog measures and must be removed.

Cleaning your new mask is necessary to reduce the chance of your brand-new masks from fogging. There are commercial mask cleaning materials on the market, but toothpaste is just as good and a much cheaper alternative.

Spread toothpaste on the lenses inside your mask, and vigorously rub for at least one minute using either a soft-bristled toothbrush or your finger. Then, wash out your mask with cold tap water. Once you are done, assess it by breathing into your mask and seeing if it fogs in any area. You may have to repeat this method once or twice, if correctly done, it will be the best ways to reduce mask fog long term.

Day to Day Treatment of Your Dive Mask

The toothpaste treatment on a new mask is essential, but you also need to use anti-fog for every dive if you wish to keep your dive mask from fogging up.

There are a number of sprays, gels, and drops specifically marketed to defog snorkel and scuba masks. Put enough product on your mask’s lenses to coat them, swish it around, then rinse your mask in salt or fresh water once before diving with it. These products usually cost somewhere in the $10 range for a 40 ml bottle, but one bottle will last you a long time.

Another option is spit and although it is free and as effective as drops, it will cause mould to grow in your mask and thus is more costly over time.

There are two minor changes in your dive habits that may make a dramatic difference if you still have mask fogging up. First, avoid touching the inside of your mask lenses, especially right after you use your defog products. Touching your mask transfers oils into it, negating the defogging agent. Second, do not breathe out of your nose. It may take time to adjust to breathing in and out solely through your mouth but exhaling through your nose is a common cause of mask fogging.


All divers have had a fogged mask lens at one time or another, but by following the above procedures the issue can keep their dive mask from fogging up and they can maximize the enjoyment of every dive.