- 1). Clean the windshield. Do not use cleaning products, such as Windex or Rain-X, that have a high amount of alcohol or ammonia. These cleaners are harmful to polycarbonate. The safest cleaner to use is warm water with mild, nonabrasive dish soap. Dry the windshield with a soft cotton or microfiber towel.
- 2). Apply a buffing compound. Make sure the compound you use is a fine grade, which is safe for plastics. Use a soft, clean cloth to rub the compound over the scratches, in circles.
- 3). Remove the compound. Wash any buffing compound off with warm water and soap. Trying to rub it off without wetting down the surface may result in more scratches.
- 4). Apply a polishing compound. Again, use a polish that is safe for plastics for this stage. If you choose a polish that contains wax, bugs will be less likely to stick to your windshield.
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