Clean the lenses first with lukewarm water and a mild dish soap
Dry with a clean microfiber cloth
Use a lens-safe scratch remover made for eyeglasses
Apply a small amount to the lens and buff gently with a microfiber cloth
Rinse and dry the lenses after treatment
Try a baking soda and water paste on very light surface marks
Apply the paste gently with a microfiber cloth, then rinse thoroughly
Use a non-abrasive plastic polish only if the lenses are plastic and uncoated
Replace deeply scratched lenses
Avoid toothpaste, baking soda on coated lenses, paper towels, and rough cloths
Take the glasses to an optician for professional repair or replacement