Ways to Prevent a Scuba Diving Mask From Fogging

[Airleron]

Burn with a lighter THEN toothpaste off the black gunk. Way way more effective than toothpaste alone

I tried the lighter trick.....then my hair caught on fire.

Don't ask.

 

[Chris Horn]

I have used tooth paste (works fine), spit (works in a pinch), cheap defog (meh...), and just recently bought a higher end defog called "SPIT" (actual brand name). It is absolutely the best thing I ever used, a tiny drop and rinse, and I'm gtg. Just my two cents though, use whatcha want, its your mask.