J.W.
We went thru this same thing. One thing I finally fiquired out was that the "normal" routine had changed. So one thing we do different is daddy gives them a bath at least once a week so that they now things can change and it is okay. The other part is I got them swim mask and snorkles. Since daddy had washed their hair differnt than mommy did they had gotten a little water in their face, not really anymore than I would so they can wear their mask and keep it out of their face. This also helped when it came time to get them into swim lessons.
However stay out of the bathroom when daddy does the bath night- she will still act like major drama the first couple of times but now mine want daddy to bath them since he plays silly games with them. They make bubble beards, coneheads with shampoo in their hair. They also have a few bubble blowing toys they take and use the soap to make bubbles. Now the bathroom is never the same after their bath but there is not the drama there had once been when daddy gave the bath. The funniest thing is the kids body paint soap, the have little foam brushes and paint the wall in the bathtub, each other, daddy. IT is a easy to get them clean and has had no problems with little girls.
Hope this helps.