I used to use microfiber cloths, but found that the lenses would get scratched. My optometrist told me that the combination of cloths and the gritty dirt was the equivalent of using fine sandpaper on the soft plastic. She recommended using a tiny drop of dishwashing liquid on each lens and then washing them with water followed by thorough rinsing. Then dry the lenses by dabbing them with tissue rather than rubbing them. My glasses now last for years with no scratches.