The shampoo is a mild solution that you can use to create a film on the inside of the lens, which can help to prevent condensation. Mix a small amount of baby shampoo with water to use baby shampoo as an anti-fog solution. After that, apply it to the inside of the mask lens, and spread it evenly with your finger. nnRinse the mask thoroughly with fresh water before diving. Repeat the process if needed. Not all baby shampoos have the same formula. It is always better to check the product's composition before use. Special-made anti-fog solutions for the diving mask are widely available. They are easy to apply, come in small containers, and last for several dives.n