What I do is this.
Goto the Color Editor/Advanced
Use the picker to pick a deep shadow area, then just pull down the saturation. I have done this on dark colored fur which sometimes has a blue tint.
Its trial and error finding the right hue but once you nail it, its effective.
Another way is to mask the area, then use the color picker tool, again pulling back the saturation. It'll keep you from affecting other areas.