Put on and take off your sunglasses evenly by holding both frame arms.
To clean your sunglasses, run them under a trickle of warm soapy water, then rinse and wipe with a soft microfibre-type cloth. Allow to dry completely before storing in a dry place.
Remember to store them in their case or microfibre pouch to protect them.
Do not leave them in direct light on a car's dashboard or on the parcel shelf.