I have a LG RT-56NZ23RB Rear Projection TV and just recently noticed some dust behind the screen shield thats sitting on the actual screen itself. How do I clean this?? I have been told its a sealed unit this part and that if they do open it to clean it more dust will appear. Is there any way to get this dust off from the outside? like a special cloth that you put up against the screen shield and it attracts the dust through the screen shield so you can slide the dust out of viewing?? Hope someone can help me out :)

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