GM Service Manual Online
For 1990-2009 cars only
    • The following materials may damage the vehicle finishes if left on painted surfaces:
       - Calcium chloride and other salts
       - Ice melting agents
       - Road oil and tar
       - Tree sap
       - Bird droppings
       - Chemicals from industrial chimneys
    • Use cleaners that are designated safe for painted surfaces for the removal of these materials.