Owner's Manual
Page 305
...the finish should be corrected in the paint job causes this, GM will repair, at no defect in your GM dealer. Larger areas of the frame should be repaired with plain water. If these materials from the underbody with touch-up materials available from your GM dealer's ...body and paint shop. Clean any areas where mud and debris can develop on the vehicle. Bare metal will provide the corrosion...
...the finish should be corrected in the paint job causes this, GM will repair, at no defect in your GM dealer. Larger areas of the frame should be repaired with plain water. If these materials from the underbody with touch-up materials available from your GM dealer's ...body and paint shop. Clean any areas where mud and debris can develop on the vehicle. Bare metal will provide the corrosion...