Toyota Lexusc Owner's Handbook Manual page 193

OCCUPANT RESTRAINT SYSTEMS
D Keep the belts clean and dry. If they need cleaning,
use a mild soap solution or lukewarm water. Never
use bleach, dye, or abrasive cleaners, or allow them
to come into contact with the belt — they may
severely weaken the belts. (See "Cleaning the
interior" on page 719 for instructions.)
D Replace the belt assembly (including bolts) if it has
been used in a severe impact. The entire assembly
should be replaced even if damage is not obvious.
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