Subaru 2008 TRIBECA Owner's Manual page 207

there are deposits, wipe the disc surface
from the center outward with a dry, soft
cloth. Be sure not to use a hard cloth,
thinner, benzine, alcohol, etc.
Do not use any disc that is scratched,
deformed, or cracked. Also, do not use
any disc that has a non-standard shape
(for example, a heart shape). Malfunctions
or problems might result.
A disc is vulnerable to heat. Never
keep it either in places exposed to direct
sunlight, near heaters or in vehicles
parked in the sun or on hot days.
5-31
Audio