I own a Sony KP57WV700 RPTV (HD, 16x9) which has a Contrast screen with a double-anti-reflective coating on it. When I attempted the clean this screen according to the instructions in the manual (using a soft cloth moistened with "mild" soap and warm water), some of the AR coating apparently came off which resulted in having large unremoveable streaks on the screen. I had to have this screen replaced under warranty (thank God, since it's a $720 part!), and I'm wondering if anyone else has had similar trouble with their Sony or other brand AR-coated contrast screen. It seems that these screens cannot be wet-wiped with anything for fear of removing some of the AR coating. Or, is this problem just generic to Sony? Also, I'm seeking a safe method, if there is one, or product to use with which I can periodically clean my screen. I have a smoker in the family so you can see why I might be concerned about this. Any suggestions or information would be very helpful. Thanks.