Put a tiny bit of dish (drop or two) washing liquid on the inside of the shield. Spread evenly with your finger. Polish until clear with a clean dry soft cloth. Don't rub the soap off.Micro fiber cloths work good for this.
This is way cheaper and more effective than anything I have ever used.
Most anti fog coatings break up the surface tension of the watter so it sheets instead of forms droplets so you can see through it.
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