Tantrums in the bathroom are a really difficult problem. You have to wash your kid´s hair and yet it is a nightmare for them. A lot of kids are sensitive to water in their eyes. And they feel like they can´t breathe when they have water dumped over the top of their head. So two alternate methods are to let them lay back in the bath in just a couple of inches of water so he can just swish his hair out. The other thing is you can buy a visor that blocks the water from coming onto his face when you are dumping over his head. Do these things first. After awhile, he will recognize that he is not going to get water in his face anymore. You are also going to bring his most favorite items into the bath so every time it comes to hairwashing time, you are going to give him a favorite item first as a distractor and then also as a reward. So when you do the dump, he is going to get a favorite item. After about a week of not having tantrums in the bath anymore, you can work back up to getting water on the face again. You can even put a favorite item as a surprise on top of his head and when you dump the water over, he catches it in his hand like this because eventually you may want to learn to swim and other things. He is going to need to learn to have water on his face.