Is it okay to remove oil/grease stains from anodized aluminum pan using vinegar?
Try this approach, as I describe on my blog:


  1) Fill the pot or pan or other aluminium utensil with water.
  
  2) Add a tablespoon of vinegar or two teaspoons of cream of tartar for every quart of water.
  
  3) Boil this solution for 10 to 15 minutes and scour the vessel with a soapy steel wool pad.
  
  4) Rinse and dry.