Scuba Diving Mask Fog Wiper

Scuba diving is a sport for those obsessed with gear, but I ask you!

Below is an image for the Scuba Diving Mask Fog Wiper

"This fog wiper is a manual device that allows the user to slide a magnet on the outside of the glass, causing an inside magnet to move in unison and wipe off fog. SIMPLE! This product works even with prescription lens masks," reads the sales description.

Or....you could just try the spit and rinse approach.