Rub a pencil eraser over the surface of the sunglasses. Rub until the scuff mark is gone. You may not be able to remove the entire mark this way.
Spray water displacement spray on the scuff mark and let it sit for one minute.
Rub the water displacement spray into the scuff mark until it is gone, or until you can no longer remove any of it.
Spray glass cleaner onto the sunglasses.
Rub the glass cleaner into the scuff mark with a microfiber cloth. Rub until the scuff is gone and the sunglasses appear clean. Make sure to remove any residue leftover from the water displacement spray.