I use Clarity “DEFOG it” solution on my eye glasses. With the lens DRY, I smear the solution over the lens with my finger, let it air dry completely, and then gently polish the lens with a soft cloth. It works pretty well in otherwise severe fogging conditions.
I used the same solution on the face shield and it didn’t work that well in fog and heavy rain. Maybe I didn’t use enough of that solution and didn’t let it air dry first. So I switched to pinlock shield/insert. With pinlock fogging of the face shield becomes a non-issue, except there are two MNOR annoyances with the pinlock insert:
- The field of view is reduced somewhat, especially top/bottom edges, so it’s a little like looking thru goggles. On a sportbike, with the forward leaning position and peering out thru the top edge of the face shield, I had to push my helmet up and/or tilt my head up a bit more. No issue on a bike with an upright riding position.
- The two-layer construction (face shield and pinlock insert) results in minor reflections (i.e., double-vision) at night from other vehicles’ headlight, taillight, street lights, etc.)
Overall, I gladly live with the two minor annoyances for the foggy-free performance.