According to very ancient traditions, incense is the preferred choice to chase away bad spirits and ghosts and whatever bad influences that may befall on someone or something, including dirty flat panels. in effect, it's a universal cleaner.

it has been used by christians since the roman times; they use it to purify the altar (to chase away bad spirits) where they perform sacrificial rites.
if it has worked for millenia, it should be very effective.

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery