Marks on LcD screen

[parsh]

Hi,

An unusual one this but I have some marks on the LCD screen of my Panasonic TX-32LXD70.  Despite many attempts at cleaning the screen the marks remain and I think they are on the inside of the screen, possibly between the screen and the LCD panel.  Is this possible?  If so how do I go about removing the screen to clean it?

Any help gratefully received.