I bought this product based on the positive reviews in order to remove a couple of routine scratches from my plastic eyeglass lens  (no antireflective or other coating).  I tried several applications and about 15 minutes of elbow grease and there was no improvement whatsoever.  This product seems more like a mild polish than a scratch remover.  I wrote a courteous note to the company asking for a refund.  They did not reply.  Yes, I wasted nine dollars, but even more disappointing was the company's attitude.