On a plastic side cover off of a 2009 Harley Davidson Road King Classic, Harley calls the color "deep Turquoise".

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I started using Blue Magic fine grade clay then I moved up to Chemical Guys medium clay to no avail, I still could not get the brown`rust`looking run stains out of the paint:

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The medium clay put a bit of a marring on the surface of the paint but removed very little.

The blemish almost looks like a brown spilled coffee stain.

I was recently told it could be that it came from under the paint that there was flash / surface rusting that wasn`t visible yet then as it matured, it came thru the paint?

From actual experience, anyone have any suggestions?