Green film on brass parts

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  • #49995
    chaplin37
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    • Topics Started: 90
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    I noticed on a watch im working on that there is this green film on any of the parts that are made out of brass including the balance wheel. I’m having a tough time removing it, any suggestions? Im thinking about running in through my ultrasonic for about an hour and see if that works.

    #64675
    willofiam
    Moderator
    • Topics Started: 75
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    sounds like WD-40

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chaplin37Green film on brass parts