When people are aggressive during a bath or being changed, it’s often because they don’t understand what is going on, and why their clothes are being removed. Even if people are saying to him, “We’re going to get you in the shower now,” he may not be understanding. What I’ve done in the past is let people with dementia “help me” help them bathe or change. For example, he could hold the fresh depends while two people clean up his dirty one. He could wash his face with the washcloth (or even just hold a towel) while he’s being bathed. I’m also thinking that perhaps a bed bath (if this isn’t already what you’re doing) may work better than a regular, shower-type of bathing method.