I know what you mean. How I know about pink gu has nothing to do with genital fungle infections either. Mine had something similar when I first brought it. I cleaned it off and it never came back. It's just a little drop of the O.A.T from the engine coolant. Seems to be a master at escaping. If I was you just clean it and keep a close eye on it. However if it's managed to leak a little there also check the heater matrix connections as you may well find more gu on that.