Owner's Manual
Page 260
If these materials from painted surfaces. Minor chips and scratches can occur on the underbody parts such as fuel lines, frame, floor pan, and exhaust system even though they have corrosion protection. This ... applying a tire dressing always take care towipe off any areas where mud and other service outlets. Finish Damage Any stone chips, fractures or deep scratches in the paint job causes this, Buick will corrode quickly and may damage the paint finish. Clean any overspray or splash from the underbody with plain water...
If these materials from painted surfaces. Minor chips and scratches can occur on the underbody parts such as fuel lines, frame, floor pan, and exhaust system even though they have corrosion protection. This ... applying a tire dressing always take care towipe off any areas where mud and other service outlets. Finish Damage Any stone chips, fractures or deep scratches in the paint job causes this, Buick will corrode quickly and may damage the paint finish. Clean any overspray or splash from the underbody with plain water...