Use a soft microfiber cloth and simply spray mist water rubbing or alcohol to gently clean your Lens. DO NOT use Windex type cleaners that are for glass only, it will damage the Lens. If you have scratches, there are many great products you can buy at your local Auto Parts store, Hardware, Walmart, Amazon etc. that are made to help remove scratches from Acrylic and Polycarbonate plastics. If you want to buy just replacement lenses, you can buy directly from us or from your local hardware store. The lens size you’ll need should be stated on a sticker under one of the 4 frame edges – when flipped up.