GM Service Manual Online
For 1990-2009 cars only
  1. Wash the vehicle in lukewarm or cold water.
  2. Do not wash the vehicle in hot water.
  3. Do not use strong soap or chemical detergents.
  4. Flush all the cleaning agents from the surface while wet.
  5. Apply body wax to the painted surfaces immediately after the vehicle has been cleaned. In order to ensure continuing protection of the finish, periods between applications should be short.