stains on filter don't get off

Started Oct 23, 2012 | Discussions thread
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b4cktr4ck
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stains on filter don't get off
Oct 23, 2012

Hi,

I recently bought a new Hoya Pro1 CPL few months ago, used only a few times, just realized it got stains that don't seem to get off with standard cleaning tools (microfiber cloth, lenspen)

any idea?

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Canon EOS 6D
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