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I feel its the mild abrasive. I have used it to clean all types of metal, since I was a young military man. It also works great on canvas straps, tennis shoe rubber, & teeth. :D

Simple Green can...

A homemade paste of baking soda & a toothbrush can work on that green too.

Stick with what maddafinga said.
I would NOT use CLR, I use it a lot on household appliances & I have seen very different reactions to metals & finishes; even the ones that are O.K.'d on the...