Well I can tell you Ultra Brite toothpaste doesn't work. I'm convinced the front surface of this lens got itself etched somehow. Back in the junk box this Rolleiflex goes. I refuse to believe this lone single little front element, already extracted from the camera and ready for polishing, is worth 225 dollars of time and materials. It would probably spend 5 minutes on the polishing bench, and into the coating chamber. MY money doesn't come like that.