Ziory Women's Eyewear Sunglasses Round Circle Cat Eye (Brown) Product Maintenance: Please hold both sides of the lens and rub it gently. And please don't rub it hard at only one single side. Clean the lens by water or wipe them by the soft cleaning cloth included regularly. Do not use alcohol or any other chemicals to clean the lens, to avoid surface broken. Do not maintain the sunglasses in such bad environment of high temperature or long tme damp, to avoid deformation.