Tips To Defog Scuba Mask

Tips To Defog Scuba Mask

Girl defog scuba mask

- JonMilnes

Unless you do something about it, it’s bound to happen, your mask fogs up during a dive.

If you forgot what your scuba instructor taught you on this subject here is a small guide to avoid it, without you having to buy “mask defog liquid”.

New Scuba Mask

After buying a new scuba mask you want to wash it before using it.

If you haven't bought one yet, here's What To Look For When Buying A Mask.

All new masks have a layer, protecting the lens, which you want to remove before going diving.

If not removed, this layer will make it nearly impossible to see through the mask while scuba diving, because of fog.

To rinse off this protective layer you need to use regular toothpaste. Rinse it thoroughly using an old toothbrush and a toothpaste amount filling the head of the brush.

Brush each lens 2-3 times for at least a minute on each lens, only applying a small amount of pressure. Afterwards rinse with water and the mask should now be ready to use.

Defog scuba mask with toothpaste

An old toothbrush filled with toothpaste does the trick for new scuba masks - Credit: Public Domain

Using the Scuba Diving Mask

You still need to rinse the scuba mask before each dive to keep it from fogging up. This can be done with toothpaste you gently rub on the lens and rinse off in the water just before you put on the mask. Instead of bringing toothpaste on each dive you can also use spit.

For an easy clean: just before you go diving, spit in the mask, rub it around and rinse it with water. This you need to do right before you put on the mask as well, otherwise it won’t work.

If you remove your mask before you go down underwater, simply spit in the dive mask again and do as before.

Defog scuba mask by spit

A foggy scuba mask needs some spitting

Defog Scuba Mask by Other Means

If, for some reason, you don’t want to spit in your mask there are other alternatives.

Some say that spit, because of a large amount of bacteria, over time will make your mask moldy. This I found not to be true. I’ve had the same mask for about 10 years, and I mainly used spit for defogging my mask before every dive without ever having mold in my mask.

And since you spit in the scuba mask before you go diving, I don’t think there is much of a chance of large amounts of bacteria after the dive and cleaning of the equipment.

It is possible to buy an “anti- fog diving liquid” that you can use similar to the spit. This works in the same way as spit or toothpaste, though the spit gives you one less thing to bring on a dive trip.

Also soap or shampoo can be used for defogging a mask; use it in the same manner as spit. It is preferable to use baby soap/shampoo, in case you get some of it in your eyes, this will not hurt the same way as regular soap/shampoo.

This is often used by dive centers, if they have the amazing service of preparing your gear. This way the dive guide doesn’t have to spit in 20 masks every day.

Tips To Defog Scuba Mask
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Here's our guide in Choosing A Dive Center.

Do you have an experience in removing fog from your scuba mask? Tell us your best or worst fog removing way, leave a comment!


About The Author

Torben Lonne

Torben is a top skilled PADI MSDT instructor. He has worked several years with scuba diving in Indonesia and Thailand – and dived most of his life in most of the world.

He is also the co-founder and chief-editor of you can always catch him here [email protected]


  1. mario jugador

    If your masks fogs up underwater you put small amount of water in and clear it BUT it fogs up again after a few seconds…DO YOU KNOW how to make it last longer? like for the rest of the dive?

    • Torben Lonne

      Hi Mario,

      Sorry no I don’t think there is another option. The best advice I can give you would be to prepare your mask properly before the dive. And usually it want fog up.

  2. toto poblador

    i defog my mask using softdrink like cocacola.

    • Torben Lonne

      Seriously, does that work? Never heard about anyone using cola as a defogger.. Is it better than soap and spit? I’ve have to try it next time. Thanks for sharing your tips.

  3. Helena Lars

    Thanks for the tips. Before I used the defog drops. Now I bring a small spray bottel with water and a bit soap. Only a small spray and it last for the whole dive. So much cheaper and easiere to get a holde off.
    Thanks Torben :)

    • Torben Lonne

      Great to hear, thanks for commenting. Glad I could help!

  4. Cedric Bourgoin


    for those who have a fog problem during the dive, here’s a small tip you may consider :
    Having some fog can be very painful for your diving experience. To avoid stopping every two minutes to fill it with water and empty it, just place a small amount of water inside AND KEEP IT. When you have some fog, just balance your head down to rince the fog.
    Ok, you will dive with water on your nose but this is less unconfortable than stopping every two minutes to totally rince you mask :)

    • Torben Lonne

      Hi Cedric,

      it’s a good tip! I have a small beard so I always have some water in the mask.

      Though I prefer to clear the mask before the dive, with spit, it keeps the mask fog free for the whole dive.

    • Cedric Bourgoin

      Hi Torben, I always shave my 3 days beard before going diving : no matter how you look, diving is too enjoyable to be bored by fog or water in the mask ^^

    • Torben Lonne

      True! The “look” doesn’t matter underwater :) And there’s nothing worse then no view underwater.

  5. David Tombs

    I have had a mask go very yucky with just spit, but its Algae not Bacteria and may be related to fresh water diving. But I have been diving with a new mask for over 3 years now, diving several times a week using a proprietary defogger and nothing but a nice clean mask! It’s only just occurred to me reading these posts. I suppose my other mask could have retained water more between dives, I hope its not my spit! Torben , you are beginning to sound like a typical British BSAC diver, you do not seem to start the day with a massive fry up, and run once a year though!

  6. Bradley

    I haven’t dived in a while, but in the day I used to rub my mask lenses with a bit of shave cream to ward off fog. Crazy as it sounds, it worked. I can’t say if the newer formulations would behave the same, but maybe it’s worth a try.

  7. Jaime

    In the other hand, keep your mask clean and rised with fresh water after dive dryed with a soft towell.

  8. Tracy

    Use a small flame to burn the residue off. Obviously you need to be cautious around the sides but the flame is not there long enough to do any damage. You can actually see the residue burn off. Make sure you do both sides of the lenses. I have done this with several masks and it works great.

  9. sidik

    I usually have fog problem , because I always use sun screen before diving . After several time I never use sun screen and leave my face dry before using mask , the problem stop ..

  10. Mick Bourke

    A bit of Vasoline on the Mustache will prevent water getting in for us facial hair members.


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