Here ya go, since I live in the south, we haven't had any vehicles come in with the concern but this should help. Go to the website listed in the bulletin. But as it says, GM won't pay for it.
Preliminary Info #PIT4548
Chrome wheels and other chrome trim may become corroded if not washed after driving on roads that have been sprayed with magnesium, calcium or sodium chloride. These chlorides are used on roads for conditions such as ice or dust. The damage is not covered by the vehicle's warranty. Always wash the vehicle's chrome with soap and water after exposure.
Recommendation/Instructions:
Engineering is evaluating a product known as Wheel Wax and it is in the preliminary stage. However, some have reported successful use of this product as a barrier against the corrosive effects of chloride sprays listed above. More information is available at
www.wheelwax.com.
Note: The use of this product or any like it, would be at the customer's choice and expense. It is still recommended to wash the vehicle's chrome with soap and water after exposure, even if using this product.
© Copyright General Motors Corporation. All Rights Reserved.