Reason: the oxide film is not resistant to strong alkaline cleaning solution, so neutral
cleaning solution can be used
Solution 1: avoid washing the car with strong alkaline cleaning fluid sprayed directly on
the wheel brakes, and use general foam cleaning.
Solution 2: when washing the car, the user cannot distinguish whether the liquid is
neutral / strongly alkaline. When washing the car, inform the merchant that once the
oxide film coating is sprayed, it is irreversible
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