I've tried two products that seem to help quite a bit with this. One is Fog Zero and the other is Clarity DeFog-it. Both are safe for sport optics.
Ordered some Clarity Defog-it with expedited shipping, and used it today and Weds on my binoculars while hunting.
Makes a huge difference. Was having significant problems with them fogging up earlier in the week, reduced to no fogging. GREAT TIP.
