Aluminum pots, although safe to use as long as you follow relative tips (please refer to Is It Safe to Use Aluminum Pots), becomes dirty easily sometimes. After being used for a period of time, a layer of black color will be produced on the surface of some pots. If you follow usual cleaning steps for dishes and bowls, you may make great effort and still fail to remove the black color off. As a matter of fact, a rule has long been found that the more difficult to do a thing seems to be, the easier its solution turns out to be, because the nature has a surprising chasing chain.

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