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Like most of here on this site, I am having to do most of my own work on my car. I have decided it is time to polish the chrome parts. I know that some parts are stainless steel and other parts are aluminum. Some parts though, I have yet to figure out. Some of the aluminum parts are either "chromed" or "anodized"(clear plastic-like coating). Is there a simple inexpensive way to tell the difference between the stainless and the aluminum?