Philips DVD711AT98 - Manual (Page 35)

BEFORE REQUESTING SERVICE 35
Cleaning discs
Some problems occur because the disc inside the player
is dirty.To avoid these problems clean your discs regularly, in the
following way:
● When a disc becomes dirty, clean it with a cleaning cloth.Wipe the disc
from the center out.
Caution: Do not use solvents such as benzine, thinner,
commercially available cleaners, or anti-static spray intended
for analog discs.