Defogging Your Diving Mask

a close up of a tube of toothpaste with the cap open and white toothpaste oozing out

Dive Mask Defogging Tips

Going scuba diving is a very enjoyable hobby, especially when you discover your favourite marine life. Yet, there is nothing worse than your dive mask constantly fogging up.

Many scuba newbies are unaware of the residue that is left behind on the lens from the manufacturing process. If you do not remove this coating from the inside of the lens, the mask is highly likely to continuously fog up, regardless of how much anti-fog spray you use.

After you have purchased your new scuba diving mask, apply a thing layer of ordinary white toothpaste to the inside of the lens. Use your fingers and smear the toothpaste so it completely covers the lens. Take care not to use toothpaste that contains bleaching agents. Rinse off thoroughly with clean, fresh water. You may need to repeat the process a couple of times.

This method is for masks with glass lens only. DO NOT use this method on polycarbonate lens as this kind of lens can scratch very easily. Masks such as the Aqualung Sphera Mask come with an anti-fog coating and should not need this kind of preparation. As always, check the manufacturer’s instructions.

There are some sites that recommend using a flame to burn out the manufacturer’s coating on the mask. This is not a very good idea as you may burn the silicone skirt during the process.

Even if your mask has been prepared with the toothpaste-cleaning trick, you need to defog it before you dive. Many divers spit into the mask, rub it around with their fingers and then briefly dunk it in clean water. However, spitting does not work too well if the mask dries completely before your dive.

If spitting does not work well for you, or you are a lady diver who is shy about spitting into your dive mask, then you can use a commercial defogging agent. There are a few brands on the market and usually work better than spit. You should put a few drops of the agent inside your mask and rub it around with your finger, then rinse it briefly in fresh water. Be sure not to actually wash the defog agent away as the idea is to leave a thin layer of it behind after rinsing.

Another great anti-fog is baby shampoo. A small bottle of watered down baby shampoo works just as well as an anti-fog spray. Baby shampoo is not as strong as standard shampoo, smells nice and is less irritating to your eyes. Use this in the same way as you would use a commercial anti-fog spray.