Not sure if this is the right place so Mods feel free to move. Got dark shadow patch on top right hand of LCD screen it's not superficial. Don't really notice it up close but is noticeable when at watching distance. Looks like a dirty mark but isn't on surface of screen. Anyone know a way to sort it? Bar buying new TV? Any help appreciated, keeps drawing my eyes to it. Suspect Mrs Ghost won't go for the new TV option