If ever I get something truly burned on to the inside or outside of my stainless steel or corning ware, oven cleaner does the trick. But my aluminum is another story. It's plain old aluminum, no paint or ceramic on it (I mean reaaaalllly old). When DH burns something onto it I have to use a lot of elbow grease. I came across a website that mentioned a great cleaner for aluminum and now I can't find it again. I searched these forums, but it is not mentioned here either. I seem to remember that it had "Kleen" in the name of it, like "------Kleen". Does this ring a bell with anyone? I think it was a thick liquid or a gel. I appreciate your help.