[Gimp-user] How to control one color only?

This is another of those things I knew how to do in PShop and am now trying to duplicate in GIMP. I have a photo of a flowchart drawn in green marker on a whiteboard. Photo taken with an iPhone, so quality is yuck. I brought out the greens with Color Enhance, but now the white board has areas that are yellow on the right and blue on the left. 

How to target these "problem colors" and desaturate or otherwise move them back to white?

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