I just wipe them off once in a while. I get used to looking through them, even though they are wet.

As for fog, other people's climates might work differently, but here in Atlanta during the winter, my glasses fog up at stop lights. I just pull them down my nose until I can get going again, which lets the cold air back behind them to defog. I think it's the heat and moisture from my face that causes the fog.

I found that my older, bigger-lensed glasses protect my eyes better than my smaller-lenses from particles and wind that makes me tear up.