Baby shampoo is the right answer.
On new masks, I use toothpaste. Then baby shampoo.
If still fogs, then very fine sand, very very gently scubas the inside (a little water to moisten the sand).
It worked 35 years ago, and it works today. Needless to say, many of the techniques above will work as well.
On new masks, I use toothpaste. Then baby shampoo.
If still fogs, then very fine sand, very very gently scubas the inside (a little water to moisten the sand).
It worked 35 years ago, and it works today. Needless to say, many of the techniques above will work as well.