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i only ever do it by accident and it make me jump because it buzzes and the picture wobbles! they put the degauss button right next to the image controls... >>
LOL... Luckily I'm using the Philips 107s21 monitor, which has a menu for less used functions, including degauss.
Actually, degaussing works perfectly against dust on the screen

but on the other hand, I could use the vacuum-cleaner more often...