Hi Everyone, hope someone can help me here. I just went "thrifting" and found a 30 cup coffee urn in very good condition for $3.75. It's aluminum, with the outside having a textured swirl pattern to it. The inside looks as though it had been barely used. But I would like to give it a good cleaning and polish it up if I can. Seems I remember being able to clean aluminum by boiling water with cream of tartar to take out any stains. Does that sound familiar? I normally use Barkeeper's Friend for scrubbing any of my pots & pans but they're all stainless steel and I don't want to take off the finish, so if you've got an idea for that, I'd like to hear it. Meantime, I'll be checking a book I bought from Reader's Digest several years ago that gives you helpful hints on cleaning, gardening, etc. using household items like vinegar, baking soda, hydrogen peroxide, stuff like that.