Okay, here's a way to cheat. Create a canvas the same size as your image. Give it a white background. Copy and paste two copies of your image on top of it. You'll have three layers. Make the top layer invisible for the moment. activate the layer that shows. Go to layer style/blending options and adjust the opacity until you get it as washed out looking as you like. Make your top layer visible again, select and delete everything you don't want to have the saturation you want (eyes, lips, etc.) then adjust the transparency layer on that one until it looks right to you.

Talent is God's gift to you. Using it is your gift to God.