Rinse under cold water, blow drops off, wipe with microfiber. I've had glasses 51 years now.
If more than just dusty, rinse under cold water then spray with distilled water containing a little bit of that automatic dishwasher anti-spot agent.
Distilled water and the anti-spot rinse aid is what the eye place in Germany told us to use. At least, i think so, they only spoke Deutsch, and mine is not great. But it seemed to work.