Use dish soap. A very small drop on your finger (not much) and wipe it over the lens. It does distort your vision, a bit but not as much as if they fogged up.
If your vision is distorted too much with the soap you've used too much. Wipe off a bit with tissue.
You only need enough soap to prevent condensation buildup.
I where glasses, believe me I have spent hundreds of $$ on anti-fog stuff. None work good enough for cycling. Some work great for the temperature change from outdoor to indoor. But I guess us cyclists generate too much heat and moisture.
Digger.