Don't shower. No fog. Amazing! Ok, but really. Use an exhaust vent. Open a window. There are glass cleaning products which claim "no fog." Read the labels where you buy glass cleaners, or look for these products at a hardware/auto store. They are also sold for use on the interior of the glass in your car. I have used some of them, even ones supposed to work for glasses, but they didn't seem to work well. One product was being demonstrated years ago in wallyworld. The lady cleaned my glasses with the stuff, then put them into a stream of steam from a vaporizer-type thingie. No fog! Then I wrapped my winter scarf around my face & went outside into the cold Minnesota winter. FOG!