Cleaning the seat belts

solution.  Use clean, lukewarm water and soap solution.

using chemical Do not clean the seat belts using chemical cleaning agents. Do not dry the seat belts by warming them above 176 °F (80 °C) or placing them in direct sunlight.

WARNING
Do not bleach or dye seat belts as this may severely weaken them. In a crash, they may not be able to provide adequate protection.

    See also:

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