From a header coating company: To maintain a beautiful finish and prevent corrosion for years to come, periodic maintenance of the coating is required. We recommend periodic cleaning of your parts to remove road grime, salt and oil from the coatings and any non-abrasive aluminum polish for heavily oxidized or stained coatings.
Stains such as oils, transmission fluid and antifreeze can be easily removed with fine steel wool or Scotchbrite™ (red) and any non-abrasive aluminum polish. After removing the stains, polish to a high luster with the aluminum polish and a soft cloth.
Hope this helps..
