Porsche 911 Carrera - Manual (Page 189)

If the disc gets dirty, clean the disc by wiping
the surfaces from the center to the outside
in a radial direction with a soft cloth. Do
not use a conventional record cleaner or
anti-static record preservative. Disc cleaners
are available in audio stores.
Antenna
Always unscrew the external antenna before using
an automatic car-wash.
Controls, Instruments
187