Check the maker's care instructions. Rinse loose grit with lukewarm water before rubbing.
If permitted, gently wash with a little mild dish soap, then rinse away every trace.
Use gentle fingertips around nose pads. Keep any soft frame-cleaning brush away from lenses.
Avoid paper towels, clothing and abrasive cleaners. Keep alcohol, ammonia and vinegar off coated lenses.
Blot with clean microfiber, dry thoroughly, then store in a clean case without pressure on the frame.
Read the full guide for coated lenses, frames, daily smudges and careful storage.