ever about half an hour, at the most.
( monster munch person, man, woman... camera... TV?, Tue 20 Sep 2011, 20:51, 1 reply)

ever seen it?
It fades a little but it never goes away.
(gtfomh, Tue 20 Sep 2011, 22:50, closed)

To fix.
Either get expensive degaussing coil.
Or take magnet, scrub over screen. Move magnet to distance of 1mm, and flip over. Repeat, increasing the distance gradually until you're about 3 magnet-lengths from the screen.

Take care not to scratch the screen.
(speedevil, Tue 20 Sep 2011, 23:57, closed)

I held a speaker to the side of an old PC monitor,
in the school computer lab, and convinced myself that I had permanently warped the screen, but it was all fine when I went back the following day.
( monster munch person, man, woman... camera... TV?, Wed 21 Sep 2011, 9:00, closed)