I got this in an email today and I tried it...
Apparently the electrons build up on the inside of the screen with time,
and the picture deteriorates. I found a free program that I used to 'clean' the inside of the screen and the improvement was quite noticeable. I highly recommend it. To try it, click on the following link.
The program is free, works automatically, and takes only about 45
seconds to do its job.
Click here to clean your screen -> http://www.theslurps.com/