3M Lens and Hard Plastic Cleaner can be applied with a machine or by hand. Safely removes hairline scratches or other minor imperfections from automotive plastics. 3M 39017 Lens and Hard Plastic Cleaner is the safe, easy and economical way for anyone to improve the clarity of a vehicle's headlight lenses by removing minor yellowing and scratches that can begin to affect the amount of light that is projected onto the road, and so eventually limit what drivers are able to see at night. Designed as a maintenance treatment, the cleaner can be applied either by hand or with the aid of a power tool, holding off the clouding of plastic headlights and tail lights that can happen at a surprising speed. It is usable on clear or colored plastics and its application can be combined with other 3M products for even better results.