GM Service Manual Online
For 1990-2009 cars only
  1. Remove the stains as quickly as possible before the stains set.
  2. Use a clean cloth or sponge. Always use a clean section of the cloth or sponge. You may use a soft brush if the stains persist.
  3. Use solvent-type cleaners in a well ventilated area. Do not saturate the stained area.
  4. If a ring forms after spot cleaning, clean the entire area immediately.
  5. Follow the manufacturer's instructions for all cleaning agents.