Is it okay to remove oil/grease stains from anodized aluminum pan using vinegar? I bought a brand new hard anodized pan for making roti. I used some oil while cooking. After cooking, washing I saw these stains (most likely grease) that would not be removed after washing with my usual dish washing liquid.

Pan photo

I heated the pan hoping that oil would come off. It didn't.

Then I gently scrubbed vinegar soaked toothbrush on the greasy spot. Some of the grease got removed, (50%) but it remained there in other spots.

Is my cleaning process correct?
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.