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The easy way for me is cheap. I put a drop of dish soap and fill pan with boiling water, and let it sit til it cools. Very rare is the time when I have to do this twice but it works and no elbow grease needed.
I take a cheap can of oven cleaner ($1) & spray a heavy coat onto the bad areas, then seal it in a plastic bag over night. The next day use rubber gloves & S.O.S. pad to remove the build up. Then make sure you wash it very well with dish soap & rinse, to get oven cleaner completely off for reuse. It may, or may not discolor the aluminum somewhat...but does not harm it. (I use this same procedure when cleaning my grill top every time I grill out.)
I would make sure that you know what the ingredients are in the engine shampoo before using it in a cooking pan because chemicals do leach in to them that could be harmful to your health. TSP is safe for cleaning cookware but is not really environmentally friendly because it's not easily removable during sewer water filtration. The safest way is to make a paste of baking soda and water, use a heavy duty scrubbing sponge and elbow grease. ;-)
Engine shampoo for aluminum blocks works fine. Spray it on, let it work for a minute or two, lightly scrub or agitate with a soft dish-washing brush or sponge, rinse with warm water. This does not dull the shine of polished aluminum.
It also works well on stainless steel.
Have FUN!
DearWebby
http://humor.webby.com/blog
Use an SOS pad (a steel wool pad with soap in the USA) and lots of elbow grease.
truerblue in PA
How do you clean burned stuff off of an aluminum pan?
I burnt the inside of a very strong, expensive aluminum pot.
I have a 13 X 9 inch aluminum baking pan. I baked a chicken in it with water underneath the plastic baking bag. It left dark gray water marks on the bottom of my shiny pan.