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FYI, "green" Scotch-Brite pads do not contain aluminum oxide as an abrasive. Scotch-Brite is available in many types, and the maroon color pads that you would most likely get from an automotive supply shop, do contain aluminum oxide. The abrasive in the green household pads is magnesium chloride. (Info obtained from 3M wesite and MSDS's) I am an aircraft mechanic also, and we used to use the maroon 7447 pads all the time for surface prep and cleaning of bare aluminum. I read many aircraft forums, and there was a huge debate a while back about the different colors of scotch-brite. This doesn't mean you still shouldn't clean things well.
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