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After a few
years your big screen TV might not have the sharpness that it once had. The picture may have gotten a bit dull and
dark. When you use it everyday, dust and dirt pile up on the optical components and also the picture tubes or "mirror".
But, in a few hours we can bring back the sharpness like in the picture above. For example, when I clean my glasses
I can see more clearly than before. It is the same with all projection TVs.

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